Species Status

Abundance and Trends

Barataria Bay is a shallow (mean depth = 2 m) estuarine system in southern Louisiana separated from the Gulf of America (formerly the Gulf of Mexico) by a chain of barrier islands. The Barataria Bay population (stock) of bottlenose dolphins is genetically distinct from other dolphin populations occurring in Gulf coastal waters, including other bay, sound, and estuary (BSE) dolphin populations. Among the 31 BSE bottlenose dolphin populations in the northern Gulf, the Barataria Bay population is one of the largest with around 2,000 dolphins.

The Barataria Bay dolphin population was heavily impacted by the 2010 Deepwater Horizon (DWH) oil spill, which released an estimated 168 million gallons of oil into the Gulf over 87 days. The oil contaminated surface waters and nearshore habitats hundreds of miles away from the wellhead, including Barataria Bay.

At the time of the DWH spill, the abundance of Barataria Bay dolphins was unknown. However, analysis of data from photographic surveys done shortly after the spill indicated that there were over 3,000 dolphins in Barataria Bay at that time. Following the spill, many dolphins in Barataria Bay died, and many of those that survived could not successfully reproduce. Many of the dolphins that survived also had lung disease, impaired stress response, and other chronic diseases.  A population dynamics model predicted that, due to disease and failed reproduction, the Barataria Bay population would continue to decline for 10 years after the spill, dipping to a low point less than half of its pre-spill abundance before beginning a slow recovery. Analysis of subsequent photographic survey data suggests that the abundance of the Barataria Bay dolphin population was around 2,000 dolphins in 2019.

Threats to the Population

Ongoing threats to Barataria Bay dolphins include chronic disease and reproductive failure in dolphins that were exposed to oil from the DWH spill, and interactions with commercial and recreational fisheries. Recent studies have also documented that Barataria Bay dolphins have a high prevalence of scars from propellor strikes, and suggest that dolphins previously exposed to the DWH oil are more likely to be struck by vessels (Pirotta et al. 2026).

The Mid-Barataria Sediment Diversion (MBSD) project, previously proposed by the State of Louisiana to divert water and sediment from the Mississippi River into the northern portion of Barataria Bay, also threatened the Barataria Bay dolphins, but the project was terminated in 2025. The goal of the project was to rebuild marshland that has been eroding for decades due to oil and gas extraction, canal excavations, extreme weather events, subsidence, and sea level rise. However, operation of the MBSD would have also significantly altered the dolphins’ estuarine habitat by adding large amounts of freshwater into the bay and thereby lowering its salinity.

Scientists modeled the habitat changes expected to happen with the MBSD project to determine the likely impacts to the Barataria Bay dolphin population.  They predicted a catastrophic decline in the Barataria Bay dolphin population, with over 500 dolphins (one quarter of the population) dying within the first year of the MBSD operation. Dolphins that reside in the central and western portions of the bay were expected to be “functionally extinct” after just 10 years of the MBSD’s operation. After 50 years of operation, bottlenose dolphins across the entire bay would have been almost entirely gone, with only a small number remaining near the bay’s barrier islands. The decision to terminate the project was based on a determination that the project was no longer viable for multiple factors, including ongoing litigation, and ultimately the suspension of a federal permit by the U.S. Army Corps of Engineers.

What the Commission Is Doing

When the Louisiana Mid-Barataria Sediment Diversion (MBSD) project was first proposed as a Deepwater Horizon oil spill restoration activity in 2015, the Marine Mammal Commission identified threats to the Barataria Bay dolphin population posed by the project. The Commission provided detailed comments on its concerns and suggested alternative approaches to entities responsible for planning, reviewing, and approving the MBSD project, including the Louisiana Coastal Protection and Restoration Authority, the Louisiana  Deepwater Horizon Trustee Implementation Group, NOAA’s National Marine Fisheries Service, the U.S. Army Corps of Engineers, and the RESTORE Act Gulf Coast Ecosystem Restoration Council. Despite the Commission’s recommendations, the project was approved without the inclusion of additional measures to reduce adverse impacts on dolphins. Construction of the project began in August 2023, but the project was ultimately terminated in 2025. The decision to terminate the project was made after Louisiana’s Coastal Protection and Restoration Authority (CPRA) determined that the project was no longer viable for a number of reasons, including ongoing litigation and the suspension of the U.S. Army Corps of Engineers permit for the project.

The plans for the MBSD project highlighted potential impacts to dolphins from freshwater influx in coastal habitats, whether from natural processes such as extreme storm events, or human activities such as water or sediment diversion. The Commission convened a webinar in March 2021 to provide information on the potential impacts of low-salinity exposure on dolphins and their prey, review the findings of the 2019 northern Gulf bottlenose dolphin Unusual Mortality Event, identify data needs, and discuss options for mitigating and monitoring impacts to dolphins and their prey from future low-salinity exposure. For more information and to view the webinar, see ‘Effects of Low-Salinity Exposure on Bottlenose Dolphins.’

Commission Reports and Publications

For more information on the effects of low salinity water on bottlenose dolphin health and survival, please refer to the Commission’s March 2021 webinar on “Effects of Low-Salinity Exposure on Bottlenose Dolphins.”

Commission Letters

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Research and Monitoring

Following the Deepwater Horizon oil spill, a number of studies were conducted to understand and quantify the effects on the bottlenose dolphins in Barataria Bay, as well as other dolphin and cetacean populations throughout the northern Gulf of Mexico. These studies, part of the Natural Resource Damage Assessment (NRDA) led by the National Oceanic and Atmospheric Administration with other co-trustees, included necropsies of dead stranded dolphins, capture-release health assessments of live dolphins, and photographic surveys to determine dolphin abundance, reproductive success, and survival rate. Collectively, the findings from the studies demonstrated that the Deepwater Horizon oil spill substantially impacted the health of Barataria Bay dolphins, leading to reproductive failure and increased mortality. Findings from the NRDA studies were summarized in the Deepwater Horizon Trustees’ Final Programmatic Damage Assessment and Restoration Plan. In addition, many of the studies were compiled and published in a Special Issue of the scientific journal Endangered Species Research: Effects of the Deepwater Horizon oil spill on protected marine species (Volume 33, 2018).

The Gulf of Mexico Research Initiative (GoMRI) provided funding for continued studies of Barataria Bay dolphins that were exposed to the Deepwater Horizon oil spill. The GoMRI studies documented the persistence of chronic disease such as lung disease and impaired stress response. A model developed by the GoMRI researchers estimated that in the ten years following the Deepwater Horizon oil spill, the Barataria Bay dolphin population had declined by 45 percent. 

Species Status

Abundance and Trends

The Southern Resident killer whale population may have numbered more than 200 animals prior to the 20th century. However, with modern impacts on their prey base, opportunistic shootings prior to the 1960s, and the live capture or killing of nearly 70 Resident and Transient killer whales for marine parks and display from 1967 to 1971, the first complete count found just 71 whales in 1974.  The population increased to its peak of 96-98 whales in the mid-1990’s following the cessation of killings and captures for marine parks, which stopped after the Marine Mammal Protection Act was enacted in 1972. However, in just five years from 1996 to 2001 the population rapidly declined by 20 percent to 78 whales. Southern Resident killer whale numbers rebounded to 89 by 2006 and stabilized at 85-89 animals through 2011. However, after 2011 the population again entered a period of decline, and as of July 2025 stands at just 74 whales.

Most Southern Residents live within their natal pod and interact with members of other pods several times a year.  The three Southern Resident pods (J, K and L) differ in several characteristics, including pod size, dialect and home ranges. Within each pod, there are several family units that each descend from a single female ancestor. These units, called matrilines, are typically composed of an adult female, the “matriarch”, and her female and male offspring.  In several cases, although the matriarch has died, the family unit has remained together.

The sizes, trends in numbers, and demographic patterns have differed among the three pods.  The dynamics of the largest pod, L Pod, have largely driven the population trends described above. The pod increased to a maximum of 56-59 whales in the mid-1990s, declined to 34 in 2014, and is currently at 33 individuals.  In contrast, the next largest pod, J Pod, increased slowly in size from 16 whales in 1976 to 28 in 2010, fluctuated between 25 and 30 whales through 2016, but then suffered nine deaths through 2019; there are now just 27 whales in the pod. It is this pod that has been responsible for the recent decline in the total population size. The smallest pod, K Pod, has shown only a very slight numerical increase from 14-16 whales from the late 70s through the early 80s, to 18-21 whales through 2006. However, the pod size is currently at 14 whales.

Distribution

The three Southern Resident killer whale pods have distinct seasonal distributions along the West Coast, primarily influenced by the movements of Chinook and other salmon runs. During late spring, summer, and fall, all three pods typically frequent the Salish Sea, which includes the Strait of Georgia, Strait of Juan de Fuca, and Puget Sound, though their use of this core summer habitat has declined significantly from 2004 to 2020. From late fall through spring, all three pods generally shift to outer coastal waters, ranging from Southeast Alaska to central California. J pod tends to remain closer to inland waters, while K and L pods more commonly range offshore, particularly from the western entrance of the Strait of Juan de Fuca to Point Reyes, California.

What the Commission Is Doing

The Marine Mammal Commission has long been concerned about the fate of Southern Resident killer whales, hosting the first workshop focusing on killer whales in Seattle in April 1975. The Commission continues to evaluate and provide scientific and policy recommendations to federal agencies to support the recovery of Southern Resident killer whales. Our efforts focus on improving population monitoring, protecting critical habitats, reducing vessel disturbances, and ensuring the availability of key prey species, such as Chinook salmon.  In May 2018, the Commission held its annual meeting in Seattle, and Southern Resident killer whales were a primary focus of the meeting. Issues such as the population’s status and trends, the factors affecting its health and viability, research being conducted on it, and conservation/management efforts being taken on its behalf, were on the agenda.

In 2022, the Commission was a member of the Olympic Coast National Marine Sanctuary’s Advisory Council Whale Reporting Working Group. The Working Group was established to provide recommendations on the protection of threatened and endangered whale species that depend on Olympic Coast National Marine Sanctuary’s habitats for critical life processes, including the Southern Resident killer whale.  The Working Group provided final whale conservation recommendations in early 2023.

Commission Reports and Publications

See the Southern Resident killer whale sections in chapters on Species of Special Concern in past Marine Mammal Commission Annual Reports to Congress.

Commission Letters

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Threats

The ongoing decline of the Southern Resident killer whale population is most likely due to three distinct threats: decreased quantity and quality of prey, the presence of persistent organic pollutants, and disturbance from vessel presence and noise.

Prey Limitation

Reduced prey availability, particularly of declines of Chinook salmon populations, is a major threat to the Southern Resident killer whale population. Declines in the abundance of many stocks of Chinook salmon may be correlated to decreased reproductive rates and increased mortality rates of Southern Resident killer whales. Current research also suggests that with fewer salmon available, Southern resident killer whales may be shifting their foraging behavior due to prey scarcity, including spending less time in traditional foraging areas and moving greater distances to find suitable prey.

Contaminants

Southern Resident killer whales spend much of their lives in inland waters that are near sources of pollutants that enter the marine ecosystem through industrial runoff, agricultural practices, and wastewater. These contaminants bioaccumulate in the food web, particularly in fish species like Chinook salmon, which the whales rely on for food. As a result, the whales can accumulate high levels of persistent organic pollutants (POPs), such as polychlorinated biphenyls (PCBs), pesticides, and heavy metals, in their bodies over time. If a whale encounters a period of low prey abundance, it will mobilize energy in its fat reserves, thus releasing those pollutants into its bloodstream, which can degrade the whale’s health, affect its reproductive potential and even lead to death.

Vessels

Vessels are prevalent in the Salish Sea, traveling to and from Vancouver, Seattle, Tacoma, and many smaller ports. Vessels both large (such as cargo ships, container ships, and ferries) and small (such as commercial whale-watching boats, recreational fishing vessels, and other recreational/private vessels) can cause disturbance based on their physical presence in proximity to the whales. In addition, sound emitted from certain vessels may exacerbate that disturbance by interfering with whale echolocation used to find food and communicate with one another. Southern Resident killer whales exhibit a variety of responses to the presence of vessels, including altering their behavior and modulating their vocalizations, which can negatively impact the ability of whales to forage successfully and acquire the energy and nutrients needed to survive and reproduce.

Current Conservation Efforts

Southern Resident killer whales were listed as endangered under the ESA in 2005, and a recovery plan was completed in 2008. After a 2021 five-year ESA review, NMFS concluded that “the overall status of the population is not consistent with a healthy, recovered population”, and that “Southern Resident killer whales remain in danger of extinction.” The review identified new research and conservation efforts to build upon past activities and NMFS has since focused resources on saving the Southern Residents through the “Species in the Spotlight” program.

Following ESA-listing of the population, NMFS designated critical habitat in the inland waters of Washington in 2006. In response to a petition received in 2014 and a lawsuit in 2018, NMFS proposed a critical habitat designation for coastal waters from Washington to Central California used by Southern Resident killer whales, and important habitat features such as prey availability and water quality. While the Commission supported the areas included in the proposed critical habitat, it recommended in a 19 December 2019 letter that NMFS should include sound as a separate essential feature of the critical habitat.

In addition to federal conservation action by the NMFS and Canada’s Department of Fisheries and Oceans, the state of Washington has dedicated considerable effort to reducing the threats faced by the whales. In 2018, Washington Governor Jay Inslee issued an executive order that established the Southern Resident killer whale Task Force to assist the state in identifying, prioritizing and supporting the implementation of an action plan for the recovery of Southern Resident killer whales. The Task Force, comprised of members from state, Tribal, and local governments, the State Legislature, businesses, and nonprofits, developed recommendations designed to increase the availability of Chinook salmon to Southern Resident killer whales, and decrease the risk to the whales from vessels, noise and contaminants. Washington state currently tracks progress updates on the implementation of these recommendations.

Species Status

Abundance and Trends

The first documented aerial survey of Pacific walruses was conducted jointly by the United States and the former Soviet Union in 1975, after the enactment of the Marine Mammal Protection Act (MMPA) in 1972. This survey provided an estimate of about 246,000 animals and subsequent surveys suggested a population decrease to about 201,000 by 1990. The most recent aerial survey, conducted in 2006 by the U.S. Fish and Wildlife Service (FWS), estimated the walrus population to be about 129,000 but with a large confidence interval of 55,000-550,000 animals. The 2006 survey did not cover the entire walrus range and therefore is likely to be an underestimate of the total population size.

Although the estimates between 1975 and 2006 suggest that the population declined, the differences in methods and geographic coverage between the surveys make it impossible to determine population trends over time. Surveying walruses is difficult because during the spring, when the surveys are conducted, walruses are distributed widely across the Bering Sea pack ice and spend a significant portion of their time in the water. Adverse weather conditions in this region further hinder survey efforts.

Faced with these difficulties, FWS began testing new population estimation methods in 2012 using a mark-recapture approach. The final study, published in 2022, analyzed data from 2013 to 2017 and estimated Pacific walrus abundance to be approximately 257,000 animals. Beginning in 2023, FWS, the U.S. Geological Survey (USGS), and Alaska Native hunters partnered to conduct annual vessel-based research expeditions to reassess age structure and abundance of Pacific walruses. While that work is ongoing, USGS has also used satellite imagery from 2017 to 2023 to estimate a minimum population size of 250,000 walruses.

Pacific walrus abundance is expected to decline as sea ice loss continues, although the magnitude of the predicted decline is unknown. Overall, walrus population growth rates tend to be slow, with mature females producing a calf on average every 3 years. However, natural mortality also tends to be low and walruses can be long-lived. Their only natural predators include polar bears and killer whales. They are also harvested for subsistence purposes by Alaska Natives, as authorized under the MMPA.

Distribution

Pacific walruses range across the continental shelf waters of the northern Bering Sea and Chukchi Sea. Because they rely on broken ice habitat and coastal haulouts to access feeding areas on the ocean floor, their distribution varies in response to seasonal and annual changes in sea ice cover. In the winter, breeding aggregations form in the Bering Sea pack ice where there is access to open water. As the sea ice retreats in the spring, most walruses migrate north to feeding areas in the Chukchi Sea. In years with low sea ice, walruses may migrate into the Beaufort and East Siberian Seas. Those walruses are often associated with loose pack ice, but will use coastal haulouts once the sea ice retreats north of the continental shelf waters. Most adult male walruses, as well as some adult females and juveniles, remain in the Bering Sea and use coastal haulouts throughout the summer feeding season. As sea ice begins to form again in the fall, walruses that migrated north for the summer typically return south.

Pacific Walruses and Climate Change

Walruses rest on sea ice when it is available, but will use coastal haulouts when sea ice is not present. Since 2007, summer sea ice in the Chukchi Sea has retreated offshore to areas too deep for walruses to reach the ocean floor to feed. As a result, many walruses have to travel farther to reach their foraging grounds and are now using coastal haulouts to rest between foraging trips. Thousands of walruses have been observed on land in the U.S. and Russia during late summer. Some of the coastal haulouts are located near communities where human activity and the presence of predators, like polar bears, may disturb walruses. When large groups of walruses are disturbed, subsequent stampedes can cause the trampling and death of many walruses. Stampedes not only result in trampled young animals, but can separate mothers and calves and cause injury and death of weak animals recovering from prolonged foraging trips. Additionally, traveling farther to reach foraging grounds will increase walrus energetic demands. These and other impacts of climate change and anthropogenic disturbance are likely to result in reduced overall abundance and population growth rate of walrus under a range of potential future conditions. Reduced carbon emissions and efforts to protect important haulouts and foraging grounds may help mitigate those effects.

To gain a better understanding of walrus distribution, abundance, and the formation of large coastal haulouts in response to climate change, USGS has developed methods to monitor walruses using satellite imagery. Satellite imagery allows scientists to easily monitor extremely remote locations, and recent methods using synthetic aperture radar, which relies on radar signals bouncing off Earth’s surface, can capture images of haulouts regardless of weather or time of day. Satellite imagery is being used to monitor shifts in the use of coastal haulouts and to estimate the minimum population size of Pacific walruses.

What the Commission Is Doing

The Marine Mammal Commission maintains close contact with Alaska Native communities that rely on walruses as a source of subsistence. In February 2016, the Commission led a series of listening sessions in Alaska to learn more about the challenges that Alaska Natives are facing as a result of climate change. Participants in those sessions noted that walruses are becoming more difficult to access due to adverse ice and weather conditions.

Commission Reports and Publications

For more information on the Pacific walrus, see the Commission’s 2010-2011 Annual report (pages 178-182) and 2012 Annual Report (pages 55-59).

Commission Letters

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Threats

The greatest threat to the Pacific walrus is climate change. As the pack ice that they rely on during the summer foraging season in the Chukchi Sea diminishes, walruses are increasingly forced to seek refuge at land-based haul out sites. Over the last two decades, large aggregations of animals have been observed at haulout sites near Point Lay, Alaska. Such aggregations may be dangerous for calves and juveniles if disturbance by humans or other factors cause adults to stampede. Local communities have taken important measures, in collaboration with FWS, to limit the potential for such disturbance.

Reduction of sea ice and ocean warming are also expected to increase the frequency, intensity, and geographic range of harmful algal blooms (HABs) in the Arctic. Two of the most common HAB toxins on the west coast of North America are domoic acid and saxitoxin. Those toxins, associated with amnesic and paralytic shellfish poisoning in humans, can also cause illness and death in marine mammals. A 2016 study reported that out of 13 Alaskan marine mammal species, Pacific walruses contained the highest concentrations of both domoic acid and saxitoxin. No abnormal behaviors of the sampled walruses were reported, so it is unlikely that toxicological effects have occurred; however, toxin concentrations were in the range known to cause illness and/or death in California sea lions, humpback whales, and humans, and two walruses sampled in 2019 had saxitoxin concentrations near the seafood safety regulatory limit. There is concern that increased exposure to biotoxins as sea ice continues to melt may increase the risk to both marine mammals and the people that rely on them for subsistence.

Disturbance from a variety of human activities in the Arctic, such as shipping and oil and gas development, can also have negative impacts on walruses. Marine traffic and noise associated with seismic surveys could interfere with the walrus migration or cause changes in behavior in the foraging grounds.

Although hunting of walruses for subsistence use could be considered a threat to the walrus population, current harvest levels are thought to be sustainable and will continue to be as long as harvest is adapted to match changes in population dynamics.

Current Conservation Efforts

In 2008, FWS was petitioned to list the walrus as threatened or endangered under the Endangered Species Act (ESA) and to designate critical habitat for the species. After a review of the best available science in 2011, FWS found that listing the walrus as threatened or endangered was warranted. However, the walrus remained a candidate species as FWS first considered other higher-priority species for listing. FWS made a final decision on the listing of Pacific walrus in October 2017 with the determination that the species does not warrant listing as threatened or endangered under the ESA. The Center for Biological Diversity (CBD) subsequently sued FWS in 2018 for not listing the walrus under the ESA, which was then rejected by a federal judge. After an appeal from CBD, the appeals court ruled in June 2021 that FWS had not provided sufficient justification for reversing its 2011 listing decision and must still do so. Walruses currently are afforded protection in the United States (with the exception of subsistence harvest by Alaska Natives) under the MMPA and they are listed in Appendix III of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).

In 2020, the U.S. Coast Guard requested input on routing measures to minimize the impact of increased shipping on marine mammals, Alaska Native communities, and the marine ecosystem. The Commission analyzed the distribution and seasonal movements of numerous marine mammal species, including Pacific walrus, and submitted a letter to the U.S. Coast Guard recommending preferred and alternative shipping routes to protect marine mammals. Recommended areas to be avoided to minimize disturbance to walruses included areas where they aggregate in large groups to feed and rest, such as Hanna Shoal and Point Lay. The public comment period for this Port Access Route Study closed in September 2021.

Species Status

Abundance and Trends

During the 1990s, the North Atlantic right whale population fluctuated between periods of slow decline and periods of slow growth. In the first decade of the 2000s, it grew steadily but at a rate well below those of many other populations of large whales. In 2010, the population entered a period of decline that appears to be continuing due to high levels of human-caused mortality and declining calf production. Human-caused mortality and serious injury, particularly entanglements and vessel strikes, is the greatest threat to recovery of the species. Today, there are approximately 360 North Atlantic right whales in existence, with fewer than 70 reproductive-age females in the population. Female numbers are declining more rapidly than males, and the corresponding loss of reproductive potential leads to an alarming concern about an increasing risk of extinction.

On October 22, 2024, National Marine Fisheries Service (NMFS) announced that the North Atlantic right whale population estimate for 2023 was 372 (95% credible interval ranging from 360 to 383) individuals. This estimate is based on a new birth-integration approach (Linden 2024) that enhances a previously established capture-recapture framework (Pace et al. 2017, 2021) by incorporating known births into the population model. Using the prior population model, the 2022 population estimate was 356 (95% credible interval ranging from 346 to 363). The 2021 estimate was recalculated as 364 (95% credible interval ranging from 360 to 369). These recent annual population estimates suggest the sharp population decline observed between 2015-2020 may be slowing; however, the overall long-term population trend shows this species continues to face significant ongoing threats with annual mortality and serious injury estimates exceeding species recovery thresholds. These updated population estimates are considered preliminary and will be provided to the Atlantic Scientific Review Group for consideration in the 2025 Stock Assessment Review process. Twenty mother/calf pairs were observed in 2024, and as of 10 January 2025, five mother/calf pairs have been observed in the 2024/2025 calving season.

Distribution

Although North Atlantic right whales now occur almost exclusively along the east coasts of the United States and Canada, a few individuals have been observed entering the Gulf of Mexico and venturing across the Atlantic to European waters. Their current range is closely linked to their life history, contingent upon nursery areas and feeding grounds with the necessary habitat characteristics. Many North Atlantic right whales travel from their feeding grounds off the coast of the northeastern United States and Canada down to coastal waters of South Carolina, Georgia, and Florida in winter, while a portion of the population remains in more northern waters in areas such as south of Nantucket and around Cape Cod. The warm, shallow waters off the southeast U.S. coast serve as winter nursery grounds for the whales. The North Atlantic right whales then migrate north again along the east coast to their feeding areas, many arriving in Cape Cod Bay in early spring and then moving into productive waters of the Gulf of Maine and in more recent years, the Gulf of St. Lawrence. In recent years, the waters around Nantucket Shoals have been an important area with whales present nearly year-round. The North Atlantic right whale distribution seems to be shifting, yet questions remain about the permanency of the shift and the location of significant portions of the population at any given time.

Unusual Mortality Event: 2017 to Present

Elevated mortality and serious injury levels since June 2017 led NMFS to declare an Unusual Mortality Event (UME) for North Atlantic right whales, which remains an open investigation. A total of 151 cases of mortality (n=41), serious injury (n=39), and morbidity (n=71) are included under this UME as of January 10^th 2025, which represents more than 20 percent of the population.  Vessel strikes and entanglements in rope were the predominant cause of death for those that could be examined; however, some of the whales that died could not be examined or were too decomposed to determine the cause of death. Most human-caused serious injuries (a determination that the injury is severe enough that the whale is likely to die from those injuries) and morbidity (sublethal injury or illness) cases involved entanglements, but include vessel strikes, as well as injuries or poor body condition of unknown cause.

While North Atlantic right whale deaths have been detected historically in U.S. waters, reflective of their distribution along the North Atlantic coast of the U.S., the majority of the carcasses reported in 2017  and 2019  were concentrated in Canadian waters. The increased presence of North Atlantic right whales in the Gulf of St. Lawrence in Canada is believed to reflect a northward shift in their prey, hypothesized to result from particularly strong climate-driven conditions, including ocean warming, in the waters of the northwestern Atlantic Ocean. This change in North Atlantic right whale distribution has led to an increase in bilateral communication and coordination between the United States and Canada on population management efforts and implementation of protective measures to reduce vessel strikes and entanglement in fishing gear.

What the Commission Is Doing

Stakeholder Engagement and Managing Impacts of Fishing

To reduce threats due to fishery interactions to the North Atlantic right whale population and other large whales in the Atlantic, in 1996 we recommended that NMFS establish a take reduction team in 1996, which led to the establishment of the Atlantic Large Whale Take Reduction Team (ALWTRT) and the developed of a Take Reduction Plan (TRP) in 1997. A representative of the Commission has been a member of the team since its inception. More recently, the Commission expressed concern to NMFS regarding the 2017-19 spike in human-caused serious injuries and deaths of North Atlantic right whales, the population’s low birthing rate and declining population size, and the need for immediate, strong measures to mitigate human-based threats to the species. In March of 2021, the Commission submitted a letter to NMFS on the intent to prepare a draft environmental impact statement and to amend the current Atlantic Large Whale Take Reduction Plan iterating these concerns and offering specific recommendations for management actions.

In addition to engaging on the ALWTRT, the Commission has awarded research grants aimed at right whale conservation. For example, the Commission provided funding to evaluate the potential use of on-demand fishing systems in pot/trap fisheries in 2016, 2021, and 2022. A project focused on evaluating the efficacy of using broad-scale ship speed restrictions in the U.S. East Coast Exclusive Economic Zone for reducing large whale mortalities was funded in 2020. In 2021, the Commission awarded a grant that supports advancing whale conservation and outreach with sustainable infrastructure for WhaleMap. Funding was awarded to a project in 2023 examining baleen biochemistry to understand North Atlantic right whale health in the context of climate change.

A session at the Commission’s 2023 Annual Meeting focused on climate-driven shifts in distribution, prey, and threat and included a presentation and panel discussion on climate-driven shifts in right whale distribution, reproduction, and risk exposure. At its Annual Meeting on 5-7 April 2017 in North Falmouth, MA, the Commission devoted a session to receiving and reviewing recent information on the status of North Atlantic right whales. Among other things, it was noted that annual calf production in recent years has fallen to its lowest rate in 38 years and that the frequency and severity of entanglement-related wounds has been increasing significantly. Based on the information presented and discussed at the meeting, the Commission concluded that entanglement in fishing gear was the single greatest human-caused threat to North Atlantic right whales, and that measures to reduce the lethal and sub-lethal effects of entanglement in both the United States and Canada were inadequate.

Efforts to Reduce Impacts of Ship Strikes

The Marine Mammal Commission is continuing to monitor right whale deaths and injuries caused by ship strikes in U.S. waters, and making efforts to minimize their occurrence. Vessel speed zones that were established in 2008 by the National Marine Fisheries Service (NMFS) to reduce collisions with right whales by large vessels have been largely effective. In March 2014, the Commission recommended denial of a petition by the American Pilots Association requesting that dredged channels be exempted from speed restrictions in management areas. In 2014, we met with NMFS staff to review the status of the petition and also reviewed its status at our Annual Meeting in May 2015. NMFS denied the petition in October of 2015.

In June 2020, NMFS released a report that reviewed and synthesized many aspects of the effectiveness of the 2008 rule, including the increasing use of speed limits to protect whales in other parts of the country and world, volume of traffic and regulated vessel compliance with speed regulations, volume of non-regulated small-vessel traffic, effectiveness of the rule in reducing the number of serious injuries and deaths, vessel sizes involved in strikes of right whales, navigational safety, economic impacts, enforcement, and outreach. The Commission submitted a letter to NMFS on the North Atlantic right whale vessel speed rule assessment.

The Commission hosted a webinar on April 12, 2022 focused on “Federal Agency Approaches to Reducing Vessel Strike of Cetaceans”.  The aim of this workshop was to review Federal vessel-routing and speed-reduction programs, their elements and effectiveness, identify locations where additional measures are or may be needed, and consider recommendations for next steps.  These discussions included evaluations of the effectiveness of the Right Whale Vessel Speed Rule, incentive programs for industry environmental compliance and participation, as well as tools, such as Whale Map and the Whale Alert app, for communicating whale presence in areas where vessels and whales co-occur.

Commission Reports and Publications

Laist, David W., Knowlton, Amy R., and Pendleton, Daniel. 2014. Effectiveness of mandatory vessel speed limits for protecting North Atlantic right whales.

Laist, David W., Knowlton, Amy R., Mead, James G., Collet, Anne S., and Podesta, Michela. 2001. Collisions Between Ships and Whales.

Reports prepared for the Marine Mammal Commission:

Lowry, Lloyd, Laist, David W., and Taylor, Elizabeth. 2007. Collisions Between Ships and Whales.

Weber, Michael L. and Laist, David W. 2007. The Status of Protection Programs for Endangered, Threatened, and Depleted Marine Mammals in U.S. Waters.

Reeves, Randall R., Read, Andrew J., Lowry, Lloyd, Katona, Steven K., and Boness, Daryl J. 2007. Report of the North Atlantic Right Whale Program Review.

Commission Letters

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Threats

The primary causes of mortality and injury to right whales are entanglement in fishing gear and strikes by vessels. Another potential threat include spills of hazardous substances from ships or other sources. Lastly, noise from ships and industrial activities within their range is a great concern for the whales, and the Commission provides comments on proposed activities and recommendations on how to avoid or mitigate such threats.

Current Conservation Efforts

A recovery plan for the species was adopted in 1991 and updated in 2005. In 1994, three areas were designated as critical habitat. In January 2016 those areas were expanded and consolidated into two large areas, one covering waters off the northeastern United States in the Gulf of Maine from the U.S.-Canada border to eastern Massachusetts, and the other area along the southeast coast from southern North Carolina to central Florida (see NOAA National Marine Fisheries Service (NMFS) website for critical habitat maps). NOAA Fisheries appointed two recovery teams, the Northeast Implementation Team (NEIT) and the Southeast lamentation Team (SEIT), to assist with the development and implementation of the North Atlantic Right Whale recover plan.  The NEIT and SEIT assists NOAA Fisheries Greater Atlantic Regional Fisheries Office and the Southeast Regional Office, respectively, on implementation of the recovery plan and issues related to the status and conservation of North Atlantic right whales.

NMFS and the Coast Guard have taken both regulatory and non-regulatory steps to reduce the threat of ship strikes, including mandatory vessel speed restrictions in Seasonal Management Areas, modification of international shipping lanes, enforcement, and public outreach.

To address entanglement in fishing gear, NMFS established the Atlantic Large Whale Take Reduction Team. This team has been unable to agree on all measures needed to meet take reduction goals and the NMFS has therefore developed a plan it believes will be necessary to reduce the incidental serious injury and mortality of right whales, as well as other whales. NMFS is in the process of considering additional mitigation measures in response to the impact of Northeast fisheries on North Atlantic right whales.

On February 3, 2022, NMFS announced its intent to conduct a 5-year review of the North Atlantic right whale.  NMFS is required by the Endangered Species Act to conduct this 5-year status review to ensure listing classifications of the species is accurate based on the best scientific and commercial data available at the time of the review. Findings from the 5-year status review were published in November 2022, which concluded that no change to the listing status was warranted at that time.

Species Status

Abundance and Trends

The tiny vaquita porpoise is the world’s smallest and most endangered cetacean species. The vaquita remains on the brink of extinction with approximately 10 remaining in 2023. Analysis of acoustic data from 2011 to 2018 combined with visual observations in 2017 and 2018 showed an estimated average annual rate of decline of 33%, corresponding to a population decline of 98.6% over this period. Eleven dead vaquitas were found between March 2016 and March 2020 and the cause of death for eight of those animals was directly attributed to gillnets.

Distribution

The vaquita split from its closest taxonomic relatives 4.8 million years ago and is now endemic to a small range (4,000 km2) in the turbid waters of the northern Gulf of California, Mexico.

VaquitaCPR

Given the extreme concern over the safety of vaquitas in their natural habitat, the eighth meeting of theComité Internacional para la Recuperación de la Vaquita (CIRVA-8), held in November 2016, recommended that the Mexican Government institute a carefully planned, step-wise attempt to determine whether some vaquitas could be caught and held in a temporary sanctuary until they could be safely returned to a gillnet-free environment. CIRVA-9 concluded that given the recent deaths of at least six animals since CIRVA-8 and the high levels of illegal fishing activity in the Upper Gulf, the only hope for the survival of the species in the short term was to capture vaquitas and bring them into human care. Therefore, CIRVA strongly endorsed the Vaquita Conservation, Protection and Recovery (VaquitaCPR) plan and recommended that as many individuals as possible be captured in October and November 2017 and held until the Upper Gulf is safe for their return. There was grave concern that the vaquita will follow the Yangtze River dolphin (baiji) and become the second cetacean species brought to extinction in the 21st century if further action is not taken to save the species.

VaquitaCPR undertook an ambitious field season, based out of San Felipe, Mexico from 10 October to 10 November 2017. A team of 65 scientists from nine countries was on the water for five full days and eight partial days during the operational time frame as dictated by weather. Vaquitas, in groups of one to three, were seen on eight of these days. Catch nets were set on three days and two vaquitas were captured during field operations. As noted on the VaquitaCPR website, “The first animal, an immature female, was released after veterinarians determined she was not adapting to human care. The second animal, a mature female, that wasn’t pregnant or lactating, was released after not being able to adapt to human care at “El Nido.” During the second release emergency medical care was required. Despite heroic efforts by the veterinary team to save the animal’s life, she did not survive.”

Following the field season, the Mexican government, VaquitaCPR, and CIRVA evaluated next steps. In early December 2017, CIRVA conducted its 10th meeting at the Southwest Fisheries Science Center in La Jolla, California and released the CIRVA-10 report. Their main conclusion was that the status of the vaquita continues to worsen and that no more than 30 animals remained by mid-2017. Further, the committee accepted the conclusions of the VaquitaCPR team and an independent review panel that additional rescue efforts should be suspended. Moving forward, CIRVA recommended to the Government of Mexico that the first and immediate conservation priority must be to strengthen enforcement efforts and fishing regulations, including a complete ban on gillnet possession and use throughout the range of the vaquita. The CIRVA team also issued a specific recommendation to implement ‘enhanced’ enforcement during the December 2017 – May 2018 totoaba season in areas of vaquita and totoaba gillnet overlap.

One of the real advances of this effort was the use of underwater acoustic monitoring to detect vaquitas on a daily basis and provide information for the visual search team. This was built on the annual program of acoustic monitoring that has informed estimation of vaquita abundance over the last decade. Despite the extensive loss of equipment stolen by fishermen, real-time acoustic monitoring has been used to a limited extent to inform visual sighting efforts in 2020 and 2021.

What the Commission Is Doing

The Marine Mammal Commission supports U.S. government efforts with the Government of Mexico and the international community to address the threat to this critically endangered marine mammal – incidental mortality in illegal and legal fisheries bycatch – and it has a long history of providing funding and international scientific and technical expertise to aid those efforts. The Commission has supported the meetings of the international recovery team (CIRVA) and international efforts to assess vaquita abundance, trends, and the effectiveness of measures taken by Mexico to slow the species’ decline. The Commission has supported annual acoustic monitoring of this species since 2011 and it is committed to continuing to assist Mexico in its efforts to prevent the vaquita’s extinction. Members of Commission staff, Commissioners, and Scientific Advisors served as advisors to the VaquitaCPR program, were on the leadership team, and participated in all aspects of planning and fieldwork.

Over the past decades, the Commission has taken a leadership role, in collaboration with other U.S. government and Mexican agencies, to explore ways to provide communities in the northern Gulf of California with financially, socially, and ecologically viable alternatives to the gillnet fishing that is currently driving the vaquita toward extinction and to build markets for seafood caught without harming vaquitas. The Commission has provided financial support to develop, test, and introduce vaquita-safe fishing gear and methods, increase the effectiveness of protected areas, strengthen fisheries enforcement and trade controls, and develop market incentives to sell products caught with vaquita-safe gear. The Commission will continue to press for enforcement of the permanent ban on gillnets whether used by fishermen in the cartel-driven totoaba fishery or the fishery for shrimp and finfish.

Commission Reports and Publications

Related reports:

June 2023: Survey report for vaquita research 2023

December 2021: Survey report for Vaquita research 2021 final.docx (iucn-csg.org)

April 2021: Report on using expert elicitation FINAL.docx (iucn-csg.org)

February 2019: Report on the Eleventh Meeting of the International Recovery Team for Vaquita(Comité Internacional para la Recuperación de la Vaquita (CIRVA-11))

December 2017: Report of the Tenth Meeting of the International Recovery Team for Vaquita (Comité Internacional para la Recuperación de la Vaquita (CIRVA-10))

April 2017: Report of the Ninth Meeting of the International Recovery Team for Vaquita (Comité International para la Recuperación de la Vaquita (CIRVA-9))

November 2016: Report of the Eighth Meeting of the International Recovery Team for Vaquita (Comité International para la Recuperación de la Vaquita (CIRVA-8))

May 2016: Report of the Seventh Meeting of the International Recovery Team for Vaquita (Comité International para la Recuperación de la Vaquita (CIRVA-7))

July 2014: Report of the Fifth Meeting of the International Recovery Team for Vaquita (Comité International para la Recuperación de la Vaquita (CIRVA-5))

Commission Letters

Learn More

Threats

Vaquitas are threatened by entanglement in gillnets used to illegally catch the endangered totoaba (Totoaba macdonaldi), a large and endangered fish species also endemic to the upper Gulf of California. This fishery, which first re-emerged in the early 2010’s and involves large-mesh gillnets exceptionally lethal for vaquitas, is driven by the high price and demand for totoaba swim bladders in China. Use of gillnets for shrimp and finfish fisheries, which also entangle vaquitas, has been banned in the upper Gulf of California since 2015.

Both active and abandoned gillnets pose a threat. In May 2016, CIRVA-7 noted that many totoaba nets were being abandoned as poachers sought to avoid detection and enforcement, and the committee called for efforts to find and remove such gear in the range of the vaquita. In response Sea Shepherd Conservation Society initiated efforts to remove and destroy or recycle the illegal gillnetting gear. This program, which was joined by the Museo de la Ballena and the Government of Mexico, continued through 2020 as the illegal totoaba fishing continued unchecked, with 106 recently set nets removed by the end of February in the 2019-20 fishing season by Sea Shepherd vessels alone. The net removal program was halted in January 2021 following extensive civil unrest in late 2020.

In fall 2019, the Mexican government announced it would no longer provide compensation to the fishermen whose livelihoods were threatened by the prohibition of gillnet fishing for shrimp and finfish within the upper Gulf. The government also refused to provide support for fishermen wishing to use alternative gear that would not entangle vaquitas. Facing economic hardship, many of the displaced fishermen returned to fishing for shrimp with gillnets without authorization.

The deployment, by the Mexican Navy, in August 2022, of 193 concrete blocks with 3m high metal hooks designed to entangle gillnets in the Zero Tolerance Area (ZTA) significantly reduced the fishing effort in the major portion of the current range of the vaquita.

Although the main threat to vaquitas is entanglement in gillnets, there is some concern that their small population size may also affect their persistence. The collaborators in the Vertebrate Genomes Project, including The Rockefeller University, Southwest Fisheries Science Center-NOAA, and the Mexican National Commission on Natural Protected Areas (CONANP) sequenced the vaquita genome from living tissue salvaged from animals caught in VaquitaCPR project. Analyses suggest that low genome-wide heterozygosity is due to long-term persistence as a small population rather than a recent loss of diversity, for example, from inbreeding, that might accelerate extinction. This suggests that vaquitas may be able to maintain diversity necessary for population health despite their small population size. These results support the findings of a 2022 study that suggest that vaquitas are not “doomed to extinction by inbreeding depression” and that they could recover if entanglements ceased.

Current Conservation Efforts

On 24 September 2020 the Government of Mexico announced an agreement between the Ministries of Agriculture and Rural Development, Environment and Natural Resources to promote the sustainable use of marine resources and the protection of the vaquita. The agreement established measures to regulate fisheries and landing sites in the northern Gulf of California and required the installation of vessel monitoring systems on all vessels with a permit or concession. The agreement also established a 225 square kilometer ZTA to serve as a year-round refuge area for protection of vaquita.

The 2022-2023 fishing season saw a 90% decrease in gillnetting in the ZTA. This is attributed to the deployment by the Mexican Navy, in August 2022, of 193 concrete blocks with 3m high metal hooks designed to entangle gillnets. The Navy and Sea Shepherd Conservation Society are monitoring the presence of fishing activity and taking action to relocate fishing vessels outside the ZTA and remove gillnets.

Despite these efforts, there is continued concern in the international scientific community that the Government of Mexico continues to question the incontrovertible evidence that gillnets are the primary source of vaquita mortality, and international environmental groups continue to call for further action to save the vaquita from extinction. 

On 26 July 2018, as rampant totoaba fishing continued, the U.S. Court of International Trade issued a preliminary injunction in a suit brought by conservation organizations “requiring defendants — several United States agencies and officials, and here collectively referred to as “the Government” — to ban the importation of fish or fish products from any Mexican commercial fishery that uses gillnets within the vaquita’s range.” On March 4, 2020, the National Marine Fisheries Service revoked the comparability finding under the MMPA for a number of fisheries operating in the habitat of the vaquita. The MMPA requires prohibition of the import of seafood caught with commercial fishing technology which results in the incidental kill or incidental serious injury of ocean mammals in excess of United States standards.

In June 2017, the Government of Mexico announced a permanent ban on the use of gillnets in the shrimp and finfish fisheries of the Upper Gulf of California to replace the two-year gillnet ban. An initiative between the “Museo de la Ballena” and local fishing cooperatives to develop alternative fishing gear for shrimp was launched in 2019. Three different types of “suripera” nets were designed by the local fishermen, who started testing them in late October 2019. The fishing gear appears to work effectively when shrimp are in shallow water, but is less effective in deeper water. Tests are continuing with the goal of refining the designs for broader testing.

The VaquitaCPR program (see Species Status section) began in 2017. The program was a carefully planned, step-wise attempt to determine whether some vaquitas could be caught and held in a temporary sanctuary until they could be safely returned to a gillnet-free environment. Unfortunately, vaquitas did not adapt well to captivity and capture attempts were discontinued. Instead, the team launched Project Esperanza, which focuses on gillnet removal, acoustic monitoring, supporting local fishers and organizations, and raising global awareness of the plight of the vaquita.

On April 16, 2015, the President of Mexico announced new measures to protect vaquitas, which have been largely implemented by the Mexican Navy and other agencies in a strong show of commitment. These included expansion of the protected area for vaquitas to encompass their entire range, a two-year ban on gillnets within this area, concerted enforcement, support for alternative fishing methods, and compensation to the fishing communities affected by the ban.

Species Status

Abundance and Trends

The Cook Inlet beluga whale stock was estimated to number about 1,300 animals at the time the Marine Mammal Protection Act (MMPA) was enacted in 1972, but it declined sharply in the 1990s. Between 1994 and 1998, the stock declined by approximately 50 percent due largely to unsustainable subsistence harvesting. It was assumed that once hunting was controlled in 1999, the population would begin to recover. NMFS listed the Cook Inlet beluga whale population as endangered under the Endangered Species Act (ESA) in 2008. Because the population, on average, has remained below 350 whales since then, no subsistence harvesting has been allowed under the applicable regulations.

The most recent abundance estimate for the Cook Inlet population is 331 individuals, based on aerial surveys conducted in June 2022. Although the 2022 abundance estimate is higher than the 2018 estimate of 279 individuals, and may indicate that the population is stabilizing or increasing, the low growth rate of this population, coupled with increasing human activities in beluga whale habitat in Cook Inlet, raise significant concerns about whether this population will be able to recover. NMFS conducted new aerial abundance surveys in June 2025, and the resulting population estimate is currently undergoing analysis and review.

Distribution

Cook Inlet beluga whales are year-round residents of Cook Inlet, Alaska, exhibiting seasonal shifts in their distribution that are likely influenced by environmental factors, such as ice formation, and the availability of prey. During the ice-free months, Cook Inlet beluga whales are often concentrated in upper Cook Inlet, particularly near river mouths, such as the Susitna River delta, Chickaloon Bay, Turnagain Arm, and Knik Arm. In late fall, as fish runs end and ice forms in the upper inlet, belugas disperse into smaller groups, and some migrate southward to deeper waters in the middle and lower portions of Cook Inlet. Their historic range has contracted, now predominantly focused in the upper inlet, though winter surveys and acoustic monitoring confirm continued seasonal use of the middle and lower Cook Inlet.

Critical Habitat

Two areas within Cook Inlet have been designated as critical habitat. These areas include all waters in the upper inlet except for a small exclusion area at the mouth of Knik Arm, nearshore areas in the southwestern part of the inlet, and Kachemak Bay on the eastern side of the inlet.

Status Review

In 2017, NMFS issued its first five-year status review for the Cook Inlet distinct population segment of beluga whales. The ESA requires status reviews to be conducted every five years for listed species. The review determined that although the population is not increasing as expected, it is not declining precipitously, and, therefore, the probability of extinction is lower than in previous analyses. The review also stated that the population appears to be consolidated into the upper part of Cook Inlet for much longer periods of time each year. The upper part of Cook Inlet is beluga whale habitat that is most prone to the effects of human development. NMFS announced its intent to conduct a subsequent five-year status review in February 2021, requesting new information on the status, threats, and recovery of Cook Inlet beluga whales that may have become available since the previous status review in 2017. NMFS completed its second five-year status review in September 2022, concluding that the Cook Inlet beluga whale population should retain its status as endangered.

What the Commission Is Doing

The Marine Mammal Commission has focused on efforts to conserve the Cook Inlet beluga whale since the mid-1990s. In 2015, the Commission commented on NMFS’s Draft Recovery Plan for the Cook Inlet Beluga Whale. The Commission recommended that  NMFS(1) give high priority to research directed at understanding the causes of the observed population trends, (2) support continuation of ongoing photo-identification work, (3) proceed cautiously in pursuing a large-scale biopsy research program for the population, (4) develop a robust plan for responding to stranding events, (5) fund annual abundance surveys, and (6) develop mechanisms for assessing cumulative impacts from multiple stressors on the population. The Commission continues to recommend in its letters regarding incidental take applications that NMFS and other agencies refrain from issuing authorizations for additional human activities in Cook Inlet that could affect beluga whales until they have a better basis for concluding that those activities will not exacerbate an already significant risk of extinction.

The Commission also continues to monitor implementation of the recovery plan and associated research and management actions, as a member of the Habitat and Threats Committee under the Cook Inlet Beluga Whale Recovery Implementation Task Force.

Commission Reports and Publications

There are no recent Commission reports on Cook Inlet belugas.

Commission Letters

Letter Date	Letter Description
August 12, 2024	Letter to NMFS regarding the issue of anthropogenic disturbance in Cook Inlet beluga whale foraging areas and Marine Mammal Commission recommendations.
December 13, 2021	Letter to BOEM on its draft environmental impact statement for Cook Inlet Lease Sale 258.
September 16, 2019	Letter on the modification of letter of authorization for Hilcorp Alaska LLC to take marine mammals incidental to oil and gas activities in Cook Inlet, Alaska.
August 5, 2019	Application from Alaska Gasline Development Corporation to take marine mammals incidental to construction of the Alaska Liquefied Natural Gas Project in Cook Inlet, Alaska.
May 1, 2019	Letter to NMFS regarding an application from Hilcorp Alaska and Harvest Alaska to take marine mammals incidental to conducting various oil and gas-related activities in Cook Inlet, Alaska.
March 29, 2018	Letter to NMFS regarding an application from Harvest Alaska LLC to take marine mammals incidental to the installation of pipelines in Cook Inlet, Alaska
October 5, 2017	Letter to NMFS regarding the notice of intent to prepare an Environmental Assessment for activities requiring incidental take authorizations for 2018 in Cook Inlet, Alaska
September 6, 2016	Letter to BOEM regarding an environmental impact statement for Lease Sale 244 within the Cook Inlet, Alaska, Outer Continental Shelf planning area
July 13, 2016	Letter to NMFS regarding an application from BlueCrest Alaska Operating, LLC to take marine mammals incidental to conducting oil and gas exploration activities in Cook Inlet, Alaska
March 28, 2016	Letter to NMFS regarding a draft environmental assessment for the issuance of annual incidental take authorizations for oil and gas activities in 2016 in Cook Inlet, Alaska
March 7, 2016	Letter to NMFS regarding  an application from ExxonMobil Alaska LNG LLC to take marine mammals incidental to geophysical and geotechnical survey in Cook Inlet, Alaska
September 11, 2015	Letter to NMFS regarding a notice of intent to prepare a programmatic environmental assessment regarding the issuance of incidental take authorizations in Cook Inlet, Alaska
July 24, 2015	Letter to NMFS regarding an incidental take application from ExxonMobil Alaska LNG for a geophysical and geotechnical survey in Cook Inlet, Alaska
July 14, 2015	Letter to NMFS regarding comments regarding the draft Cook Inlet beluga whale recovery plan
April 20, 2015	Letter to NMFS regarding an incidental take application from SAExploration for a seismic survey in Cook Inlet, Alaska
April 13, 2015	Letter to NMFS regarding an incidental take application from Apache Alaska Corporation for seismic surveys in Cook Inlet, Alaska
December 29, 2014	Letter to NMFS regarding a notice of intent to prepare a programmatic environmental impact statement on the issuance of incidental take regulations for beluga whales and other marine mammals in Cook Inlet, Alaska
December 8, 2014	Letter to BOEM regarding a notice of intent to prepare an environmental impact statement for Lease Sale 244 within the Cook Inlet, Alaska planning area
October 14, 2014	Letter to NMFS regarding an incidental take application from BlueCrest for exploratory drilling activities in Cook Inlet, Alaska
September 4, 2014	Letter to NMFS regarding an incidental take application from Apache Alaska Corporation for a seismic survey in Cook Inlet, Alaska
January 9, 2013	Letter to NMFS regarding an incidental take application from Apache Alaska Corporation for a 3D seismic survey in Cook Inlet, Alaska
May 7, 2012	Letter to BOEM regarding the Proposed Cook Inlet Special Interest Lease Sale 244
October 21, 2011	Letter to NMFS regarding an incidental take application from Apache Alaska Corporation for a seismic survey in Cook Inlet, Alaska
October 3, 2011	Letter to NMFS regarding the 2011 Marine Mammal Commission annual meeting follow up on Cook Inlet beluga whale conservation
March 7, 2011	Letter to NMFS regarding concern over scientific independence of the Cook Inlet Beluga Whale Recovery Team
January 21, 2011	Letter to NMFS regarding scientific independence of members of the Cook Inlet Whale Recovery Team
June 28, 2010	Letter to NMFS regarding efforts to recover the Cook Inlet beluga whale population
March 29, 2010	Letter to NMFS regarding the notice of intent to prepare a recovery plan for the Cook Inlet beluga whale
March 3, 2010	Letter to NMFS regarding a proposed designation of critical habitat for the endangered Cook Inlet, Alaska stock of beluga whales

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Threats

Based on a long time series of abundance estimates, it is clear that some factor or combination of factors is impeding the recovery of the Cook Inlet beluga whale from a precipitous decline in the 1990s.

Recovery Plan

NMFS finalized the Cook Inlet Beluga Whale Recovery Plan in December 2016. The recovery plan identified ten potential threats and ranked them in order of their overall relative concern to the Cook Inlet beluga population, as follows:

Threats of High Relative Concern

• Catastrophic events (e.g., natural disasters; spills; mass strandings);
• Cumulative effects of multiple stressors; and
• Noise.

Threats of Medium Relative Concern

• Disease agents (e.g., pathogens, parasites, and harmful algal blooms);
• Habitat loss or degradation;
• Reduction in prey; and
• Unauthorized take.

Threats of Low Relative Concern

• Pollution;
• Predation; and
• Subsistence hunting.

Current Conservation Efforts

Current conservation efforts for the Cook Inlet beluga whale are guided by the Recovery Plan, which includes: 1) a description of site-specific management actions that are necessary to achieve the plan’s goal for the conservation and survival of the Cook Inlet belugas, 2) objective, measurable criteria which, when met, would result in a determination that the Cook Inlet belugas may be removed from the ESA, and 3) estimates of the time required and the cost to carry out those measures needed to achieve the plan’s goal and to achieve intermediate steps toward that goal.

NMFS has established a Cook Inlet Beluga Whale Recovery Implementation Task Force, which is overseen jointly by NMFS and the Alaska Department of Fish & Game (ADF&G). The purpose of the Task Force is to advise NMFS and ADF&G on issues related to the recovery of beluga whales in Cook Inlet, including practicable and effective ways to implement the recovery plan. The Task Force is also a forum to increase communication and coordination between agencies and stakeholders working to recover Cook Inlet beluga whales. The Task Force has an Executive Leadership Panel, Recovery Coordinators, and two Committees focused on Habitat and Threats, and Outreach.

The Commission participates on the Task Force’s Habitat and Threats Committee. The Habitat and Threats Committee is focused on 1) improving the understanding of the existing habitat and threats, 2) identifying and assessing other potential threats to Cook Inlet beluga whales, 3) assessing the degree to which known and other potential threats are impeding recovery, and 4) identifying ways to improve mitigation or abatement of threats.

The Commission sees NMFS’s selection of Cook Inlet beluga whales under Species in the Spotlight initiative as an opportunity to focus research efforts on identifying the causes of the population’s decline and management actions that can be taken to reverse that trend.

Species Status

Abundance and Trends

Before commercial hunting began in the mid-1700s, an estimated 150,000 to 300,000 sea otters occurred in coastal waters throughout the North Pacific Ocean. In 1911, hunting was prohibited under the terms of an international treaty for the protection of North Pacific fur seals and sea otters signed by the United States, Japan, Great Britain (for Canada), and Russia. By then, only a few thousand otters remained, including a small colony of about 50 otters along the coast of central California. By the time the Marine Mammal Protection Act (MMPA) was enacted in 1972, the California population had grown from as few as 50 to more than 1,000 individuals (an average annual growth rate of about 5 percent).

The U.S. Fish and Wildlife Service (FWS) listed the southern sea otter population as threatened under the Endangered Species Act (ESA) in 1977 and adopted a recovery plan for the population in 1982, which was updated in 2003. The recovery plan specifies that the species should be considered for delisting when the average population level over a three-year period exceeds 3,090 animals.

The FWS estimated that southern sea otter abundance in 2016 was 3,272 individuals, a record high since 1972. The 2017 count declined somewhat, to 3,186 otters, but still exceeded the potential delisting threshold for a second straight year. The population has continued to decline, with a most recent abundance estimate of 2,962 otters in 2019. Full surveys were not completed from 2020 through 2023, however, a range-wide southern sea otter census survey was conducted in 2024. The U.S. Geological Survey (USGS) is currently developing a new statistical model to better account for variations in survey areas and detection efforts to more accurately estimate the population size of southern sea otters.

According to the 2021 stock assessment report, the observed decline through 2019 reflects lower numbers of otters in the northern and southern portion of the mainland range, offset somewhat by continued growth of the central portion of the mainland range and the translocated population at San Nicolas Island. The declining mainland counts since 2017 could be due to increased mortality from shark bites and other causes such as harmful algal blooms and disease.

Distribution

Historically, sea otters occurred in coastal waters throughout the rim of the North Pacific Ocean from northern Japan to Baja California, Mexico, with southern sea otters ranging from Oregon to Baja California.  Following almost two centuries of commercial hunting, sea otter populations were severely reduced; surviving southern sea otters consisted of a small colony of otters along the remote Big Sur coast of central California. Between 1911, when hunting was prohibited, and 1972, when the MMPA was passed, these otters recolonized more than 200 miles (370 kilometers) of the California coast. Today, southern sea otters occupy approximately 13% of their historic range; their current distribution extends along the central California coast from Monterey Bay to Point Conception. Mortality from shark attacks has been more frequent at the northern and southern extremes of population’s range and may be a factor in preventing or slowing range expansion of the population into seemingly suitable habitats.

Sea Otter Reintroduction Efforts

In 2022, FWS began to explore the feasibility of reintroducing sea otters to Oregon and Northern California. Following a series of fora for public input, the published feasibility report concludes that the species and ecosystem could benefit from reintroduction of this keystone species. Due to socioeconomic factors such as potential conflict between reintroduced otters and coastal fisheries, any sea otter reintroduction must be cooperatively and creatively designed to reduce liability for affected groups, and ideally, to increase and equitably distribute the benefits. A companion study by the Elakha Alliance on the potential for reintroduction of sea otters to Oregon has similar conclusions.

What the Commission Is Doing

The Commission continues to follow ongoing research into the status and trends of this population, both for the coastal “parent” population and the translocated population on San Nicolas Island. The Commission also consults periodically with the FWS and marine mammal facilities to resolve questions about the placement of non-releasable otters from this population.

In 2017, the Commission commented on proposed revisions to the southern sea otter stock assessment report. The draft report identified the potential for sea otters to become trapped in gear used to catch crab, lobster, and finfish. The Commission identified a need to establish an observer program with sufficient coverage to obtain reliable information on the rate and circumstances surrounding the entrapment of sea otters in such gear. The Commission also recommended that, as a precautionary measure, gear modifications to reduce entrapment of sea otters be adopted for crab and lobster traps, similar to those that have been in place for finfish traps since 2002. In addition, the Commission noted the need to update the southern sea otter stock assessment report more frequently. The FWS published a notice of availability of the revised stock assessment report on 28 August 2017, in which it addressed the comments submitted by the Commission and others.

In 2020, the Commission commented on more proposed revisions to the stock assessment report. The Commission recommended ways to improve the potential biological removal estimate. Given that southern sea otters have failed to significantly expand their range over the past two decades and the recent decline in the population trajectory, the Commission also recommended that the FWS make its stock assessment reviews available annually. The revised stock assessment report was made available on 24 June 2021.

Commission Reports and Publications

For more information on southern sea otters, see the Commission’s 2012 annual report.

Commission Letters

Letter Date	Letter Description
April 27, 2020	Letter to FWS regarding the draft revised stock assessment report for the southern sea otter
March 13, 2017	Letter to FWS with comments on the 2016 draft stock assessment report for the southern sea otter
January 25, 2017	Letter to FWS regarding an Application from California Department of Fish and Wildlife-Central Region to take southern sea otters incidental to construction activities in association with a tidal marsh restoration project in Elkhorn Slough, California
August 3, 2012	Letter to FWS regarding revised stock assessment report for the Southern sea otter

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Threats

While sea otters are vulnerable to natural predators such as sharks, the population also faces risks from other factors such as disease, contaminants, harmful algal blooms, availability of prey, and entanglement in commercial fishing gear. In addition, the risk of oil spills remains an ongoing concern.

In response to a 2021 petition to delist the southern sea otter, FWS conducted a species status review and determined that southern sea otters would retain their status as a threatened species under the Endangered Species Act due to threats from shark bite mortality, range curtailment, and impacts of climate change.

San Nicolas Island Translocation Attempt

One of the primary threats to the southern sea otter is the risk of an oil spill. To reduce the risk of a large oil spill contacting otters throughout all or much of the species’ range, the FWS, in the late 1980s, attempted to establish a separate population at San Nicolas Island through a translocation of otters from the mainland range. The population never grew as expected and in 2012, the FWS declared the translocation a failure. The FWS determined that moving the otters that remained on San Nicolas Island would likely result in several deaths to the animals and decided to allow the otters to remain at the island. Despite the translocation having been declared a failure, the population on San Nicolas Island continues to increase. The population has grown by about 10 percent per year over the past decade and contained about 146 otters in 2023.

Current Conservation Efforts

Sea otter conservation and recovery can provide broader ecological benefits, including improved health and resilience of kelp forests, invasive species control, reduced coastal erosion, and increased carbon sequestration. Current conservation efforts center on monitoring the status, trends, distribution, and causes of mortality of otters in this population. A key indicator of recovery of the population is its ability to expand its range along the California Coast. Currently, it appears that shark predation is an important factor limiting range expansion, particularly in the northern end of the range.

Future actions to promote the conservation and recovery of the southern sea otter will depend on the results of ongoing research, particularly if needed to respond to human-caused sources of mortality. FWS, U.S. Geological Survey, and their partners are expected to continue to conduct annual abundance surveys and respond to strandings, including conducting necropsies to identify the causes of death for retrieved carcasses.

Species Status

Abundance and Trends

Historically, an estimated 150,000 to 300,000 sea otters occurred in coastal waters of the North Pacific Ocean. These populations were decimated by almost two centuries of commercial hunting. Since the 1980s, most northern sea otter populations have continued to recover.

In Alaska, there are three stocks of northern sea otters—the Southwest stock, the Southcentral stock, and the Southeast stock. The Southwest stock, which includes otters in the Aleutian Archipelago, the Alaska Peninsula, and Kodiak Island, is listed as threatened under the Endangered Species Act (ESA). The Southcentral and Southeast Alaska stocks continue to grow or have stabilized and are not listed under the ESA. All three stocks in Alaska are protected under the Marine Mammal Protection Act (MMPA).

The overall sea otter population size of the Southwest Alaska stock has declined by more than 50% since the mid-1980s. The U.S. Fish and Wildlife Service (FWS) listed the Southwest Alaska stock as threatened in 2005 and designated critical habitat for the population in 2009. That designation includes waters out to either 100 meters from shore or out to the 20 fathom isobaths in most areas within the population’s range. FWS finalized a recovery plan for the Southwest Alaska sea otter in 2013. The most recent population estimate for this stock is 51,935 otters and is reported in the 2023 stock assessment report. It is believed that the overall population trend has stabilized in recent years. The abundance of Southwest Alaska sea otters in the western and central Aleutian Islands, however, declined by nearly 90 percent between the early 1990s and 2005. A less precipitous decline occurred over that same period in the eastern Aleutian Islands. One theory for the observed population declines in these areas is an increase in predation by killer whales. Other theories suggest that the observed declines are attributable to oceanographic changes or fisheries effects. Currently, the population trend in the South Alaska Peninsula is still in decline, while the other populations in Southwest Alaska are stable or increasing.

In contrast to the Southwest Alaska stock, the numbers of otters in the Southcentral and Southeast Alaska stocks have increased or stabilized despite thousands of sea otters from the Southcentral Alaska stock having died in Prince William Sound as a result of the 1989 Exxon Valdez oil spill. Rebuilding the population took about 25 years. Population levels in the Southcentral stock have now stabilized and may be increasing; there are estimated to be around 21,600 animals.

The stock of sea otters in southeastern Alaska has grown exponentially since their reintroduction in the late 1960s and have nearly doubled since the early 2000s. This growth, coupled with concern that sea otters are competing with commercial fisheries for sea urchins, sea cucumbers, crabs, and clams, has led to calls from Alaska State officials and some fisheries groups for a cull of the population. Although there are now more than 22,000 sea otters in southeast Alaska, the population continues to increase and remains below the region’s estimated carrying capacity.

In Washington, sea otters were extirpated by the early 1900s. Around 1970, 59 otters were captured from Amchitka Island in Alaska and released along the outer coast of the Olympic Peninsula. Many of these translocated otters did not survive, but eventually, the population began increasing. Survey counts in 2023 reported 1,343 otters, with 752 otters south of La Push and 591 otters to the north. High variability in counts since 2019 suggests that the low count in 2023 may not be an indication that the population is in decline. Instead, it is possible that increased use of offshore habitat, especially south of La Push, may explain the low counts in 2021 and 2023 when offshore habitat was not surveyed.

Distribution

Before commercial hunting began in the mid-1700s, an estimated 150,000 to 300,000 sea otters occurred in coastal waters throughout the rim of the North Pacific Ocean from northern Japan to Baja California, Mexico. In 1911, hunting was prohibited under the terms of an international treaty for the protection of North Pacific fur seals and sea otters signed by the United States, Japan, Great Britain (for Canada), and Russia. By then, only a few thousand otters remained. The survivors were scattered among small colonies in remote areas of Russia, Alaska, British Columbia, and central California.

Since the prohibition on commercial hunting in 1911, northern sea otters have recolonized or have been reintroduced into much of their historic range. By the time the MMPA was enacted in 1972, remnant groups in Alaska had grown considerably and, in the late 1960s and early 1970s, several hundred otters were moved from Amchitka Island and Prince William Sound to try to reestablish populations in southeast Alaska and the outer coasts of Washington and Oregon. Historically, the Washington sea otter stock ranged along the Olympic Peninsula coast south to the Columbia River. Currently, these otters are found along the Olympic Peninsula from Pillar Point in the Strait of Juan de Fuca south to Point Grenville on the outer coast.

Oil Spill Impacts

Based on the limited range of the southern sea otter, the threat posed by oil spill prompted this stock to be listed as a threatened species under the Endangered Species Act in 1977. While northern sea otters did not receive a similar listing, oil spills are also a significant threat to these animals; the Exxon Valdez oil spill in 1989 demonstrated the severe and long-lasting impacts of oil spills on this species. Southcentral Alaskan sea otters near Prince William Sound were severely impacted by the Exxon Valdez oil spill. It was estimated that 1,000 to 5,500 sea otters died in the first few months after the spill. In some of the most heavily impacted areas, sea otter mortality approached 90%. While sea otters in this area have rebounded since the spill, long-term spill effects were observed for decades. Based on sea otter diving behavior, a study by the U.S. Geological Survey (USGS) suggested that sea otters in the most heavily impacted areas were still being exposed to oil on a regular basis, resulting in delayed recovery and continued early mortality through 2009. This population of otters was finally determined to be recovered to pre-spill abundance in 2013 (24 years post-spill) and it was concluded that any continued exposure to lingering oil was no longer of biological significance.

What the Commission Is Doing

The Commission is closely following work being done by the FWS, USGS, and others to monitor the status of the Alaska population stocks. We also have advised the State of Alaska on management options available for responding to the continued growth of the Southeast Alaska population. The Commission reviewed updated draft stock assessment reports for the three Alaskan northern sea otter stocks in 2023.

Commission Reports and Publications

For more information on Southern sea otters, see the Commission’s 2012 annual report.

Commission Letters

Letter Date	Letter Description
May 8, 2023	Letter to FWS regarding draft stock assessment reports for three stocks of northern sea otters in Alaska
July 24, 2019	Letter to FWS regarding an incidental take authorization for construction projects in Sitka and Hoonah, Alaska
April 18, 2019	Letter to FWS regarding an incidental take authorization for oil and gas activities in Cook Inlet
April 17, 2018	Letter to FWS on the draft revised stock assessment report for the northern sea otter stock in Washington State
June 13, 2016	Letter to FWS regarding an incidental take authorization for oil and gas activities in Cook Inlet
September 29, 2014	Letter to FWS regarding an incidental take authorization for oil and gas activities in Cook Inlet
July 17, 2013	Letter to FWS regarding a draft stock assessment report for three stocks of Northern sea otters in Alaska
May 17, 2013	Letter to FWS regarding request for comments on the interpretation of specific terms as they pertain to Alaska natives’ taking of sea otters

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Threats

Northern sea otters face a variety of threats throughout their range. In the western Aleutian Islands, killer whale predation, restricted habitat use, and possibly a decline in the number of otters this habitat can support due to ecosystem-level changes are primary concerns. Elsewhere in Alaska, competition with commercial shellfish fisheries, entanglement in commercial fishing gear, oil spills, disease outbreaks, contaminants, and subsistence harvests are the primary threats.

Current Conservation Efforts

Ongoing conservation efforts are directed at monitoring changes in abundance and distribution of northern sea otters and trying to ascertain the causes of declines in southwestern Alaska. Future actions to conserve the threatened Southwest Alaska sea otter population will depend on the results of planned abundance surveys and additional research into the cause or causes of observed declines.

Researchers completed an analysis of carrying capacity for the growing Southeast Alaska stock in 2019 and estimated the carrying capacity for the entire southeast Alaska region to be 74,650 sea otters. The results of this study are expected to inform a determination of the stock’s status relative to its optimum sustainable population level, which in turn will dictate what management options might be available under the MMPA.

In addition, during fiscal year 2021, Congress directed FWS to study the feasibility and cost of re-establishing sea otters where they were once hunted to near-extinction along the Pacific coast in Oregon and Washington. The report is available on the FWS website. FWS determined that reintroduction is feasible, but additional information and stakeholder input are necessary. The Elakha Alliance, a nonprofit group with a mission to restore a healthy population of sea otters to the Oregon coast, is looking to the Congressional request to aid their efforts. The Elakha Alliance believes that the re-introduction of sea otters would make Oregon’s marine and coastal ecosystem more robust and resilient; sea otters’ well-known role in promoting the growth of kelp forests also contributes to carbon sequestration, or the removal of CO2 from the atmosphere, which could play a role in reducing global climate change.

Species Status

Mediterranean monk seals are in danger of extinction, but there are some encouraging signs: conservation efforts and coordination among countries are improving, some populations are increasing in size, previously undocumented breeding areas have been discovered, and monk seals are beginning to appear in habitats and places where they had not been seen for decades. In the last several years, small numbers monk seals have been seen in Egypt, Lebanon, Israel, Cyprus, Albania, Montenegro, Croatia, Italy, Sardinia, Syria, Spain, and Libya, and breeding has been documented in some of these countries. In light of these positive signs, in June 2023 the IUCN reclassified the Mediterranean monk seal from  ‘Endangered’ to ‘Vulnerable’.

There is a long history of human exploitation and persecution of Mediterranean monk seals, stretching back from modern times to the Middle Ages, the Roman era and even to prehistoric times. Like other monk seals, Mediterranean monk seals likely rested and pupped on sandy beaches in many areas, but over centuries of exploitation and harassment, they now almost always rest and pup in inaccessible caves that contain sandy beaches. The low pup survival rate that occurs in Mauritania is thought to result from the use of caves where pups are at risk of being swept away during storms.

Mediterranean monk seals were found regularly throughout the Mediterranean, Marmara and Black Seas, along the West African coast to as far south as Cap Blanc, and in the Canary, Madeira and Azores Islands. In the 20^th century, the species was eliminated, primarily by fishers, over most of that range, disappearing from Egypt, Israel, Cyprus, Lebanon, Montenegro, the Black Sea, Italy, Sicily, Sardinia, Corsica, France, the Balearic Islands, Spain, Tunisia, and Morocco.

They are now three isolated reproductive populations.

1. Eastern Mediterranean: primarily in the islands of the Ionian Sea off western Greece, along the mainland coast of Greece, in the islands of the Aegean Sea between Greece and Türkiye, along the Mediterranean coast of Türkiye, and recently in northern Cyprus.
2. Madeira Archipelago: west of Morocco and southwest of Portugal, in the Desertas Islands and on the island of Madeira.
3. Mauritania: along a short stretch of the Cap Blanc Peninsula, on the west African coast south of the Madeira Archipelago.

The status of a very small population of monk seals in eastern Morocco and possibly Algeria, is unknown.

The most recent total population is estimated to be 815-997 individuals. Researchers currently estimate that the eastern Mediterranean population is no larger than 450 adult animals, but this estimate is uncertain. The majority of these seals are found in Greece, with most of the remaining animals found in Türkiye. The latest reporting suggests a range expansion and an increase in sightings in Türkiye. At one time, the largest population of nearly 320 animals had been on Cap Blanc Peninsula, but it was reduced to roughly 100 seals following a large die-off in 1997, possibly due to a toxic red-tide event. Since then, that population has rebounded and has been estimated recently to number approximately 360 seals. A small colony of approximately 20 seals exists in the Madeira Archipelago.

What the Commission Is Doing

In recent years, the Marine Mammal Commission’s Research Program has provided support to scientists for work in four areas:

1. Development of a genetic research protocol, and optimized sample collection and laboratory methods, to be used in a preliminary assessment of the genetic characteristics of monk seals in Greece. The results of this research, published in 2016, demonstrated that the species has extremely low levels of genetic diversity. Three genetically distinct populations were identified – Cap Blanc, Aegean Sea, and Ionian Sea.
2. Monitoring monk seals recently discovered to be breeding at Evia Island, Greece, a 2013 research grant, which resulted in in two publications.
3. Establishment of the “Hellenic Monk Seal Register” of genetic information on monk seals in Greece, also a 2013 research grant, which resulted in in one publication.
4. The Commission is funding an effort in Albania to increase local awareness and stakeholder involvement in the region to encourage protection of Mediterranean monk seals.
5. A 2018 grant funded research focused on the evaluation of marine protected areas at protecting juvenile Mediterranean monk seals.

In addition, the Commission has provided support for cooperative research efforts between scientists working on the conservation of Mediterranean and Hawaiian monk seals, and it participated in a scientific roundtable at the Greek Embassy to review and identify priorities for Mediterranean monk seal conservation. That meeting endorsed efforts to identify and protect core monk seal habitat and to develop community-based initiatives that enhance local involvement and seek support from people living near core seal habitat and from stakeholder groups, particularly those engaged in fisheries. The Commission also facilitated the formation of the Rare Pinniped Conservation Network, RAPCON, a network to foster organization and sustained collaboration among individuals working to conserve rare pinniped populations globally.

Commission Reports and Publications

To date, the Commission has not drafted any reports for the Mediterranean monk seal.

Commission Letters

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Threats

Threats to Mediterranean monk seals include human encroachment and critical habitat destruction, alteration and fragmentation, deliberate harassment and killing by fishers who consider them competitors for fish and a source of damage to their fishing gear, and incidental drowning in gillnets. In a recent survey, fishers reported damage to their fishing gear by monk seals on 21 percent of their fishing trips. Deliberate killing has been the most frequently diagnosed cause of monk seal deaths in Greece, and is a serious problem in Türkiye. One-third of monk seal deaths in Greece in the early 1990s were attributed to deliberate killing by fishers. In 2011 and 2012, nearly 20 percent of all well-documented monk seal deaths in Greece were attributed to deliberate human causes, such as gunshots likely inflicted by fishers. Disease outbreaks, toxic algal blooms, disturbance of pupping caves, rock-slides or cave collapses, shark predation, and abnormally low water temperatures are also threats to individual populations. In addition, recent research has found that the species has experienced a significant loss of genetic diversity and at least the eastern Mediterranean population, which likely contains genetically differentiated sub-populations, is experiencing significant levels of inbreeding.

Presumably as an accommodation to their harsh treatment by people, Mediterranean monk seals have retreated to what is likely marginal, suboptimal habitat. Along the Cap Blanc Peninsula, seals rest and pup in caves that are exposed to storms that can wash pups away. In Türkiye, seals have been observed resting in the water in caves that do not have beaches or haul-out areas. It has been suggested that the species cannot recover unless it can reoccupy open beaches.

Although a small number of dedicated scientists and environmental groups have made significant advances toward Mediterranean monk seal recovery since the late 1970s, more efforts are needed. A major impediment has been the unwillingness or inability of national governments to carry out effective conservation programs or provide more than minimal levels of funding for monk seal research or conservation within their respective jurisdictions. As a result, most monk seal conservation work has depended on the efforts of (and funding from) non-governmental organizations such as MOm (The Hellenic Society for the Study and Protection of the Mediterranean Monk Seal) and CBD Habitat (Spain), and on government organizations such as the Madeiran Park Service (Serviço do Parque Natural da Madeira) (Portugal).

Current Conservation Efforts

Conservation efforts began in the 1970s, and today national and international laws and treaties provide protection throughout its range, including the establishment of protected areas, some of which prohibit or restrict fishing. In addition, non-governmental organizations contribute important conservation efforts, such as the rescue and rehabilitation of injured, sick and orphaned seals, public outreach and education, and research.

One of the first and most significant actions was in the northern Aegean Sea, where the National Marine Park of Alonissos was established by the government of Greece in 1992. Covering 2,200 km² (850 mi²) of nearshore waters around the Northern Sporades Islands, the park was meant, in part, to protect one of the largest surviving colonies of monk seals, which numbered about 50 in 2000. Commercial fishing is restricted within a substantial portion of the park, and MOm has worked with local residents and park visitors to promote human attitudes and behavior that allows seals and people to coexist. Although enforcement of conservation measures in Greece has been weak, the government of Greece also established a national park on the northern coast of Karpathos and in 2019 created a marine protected area to protect one of the largest monk seal colonies in the Mediterranean.

Habitat protection is widely recognized as the greatest conservation priority. Monk seal researchers agree that a network of protected areas is necessary for the Mediterranean monk seal population to survive long term. In addition to the park in the Northern Sporades Islands, protected areas that restrict fishing have been established at locations on the Aegean and Mediterranean coasts of Türkiye, in Cyprus, in the Desertas Islands in Madeira, and off the Cap Blanc Peninsula, Mauritania. At least some of the protected areas appear to have been effective in reducing entanglement rates and increasing the survival of pups. The fishing restrictions and pupping-cave protections provided on the Cap Blanc Peninsula have also contributed to that population’s recovery of the population from the die-off suffered by that population in 1997. Nonetheless, monk seal biologists and conservationists believe that much more habitat needs to be protected, and that monitoring and enforcement must be improved. The government of Türkiye has enacted regulations that significantly increase limits on activities that can create disturbance in caves used by monk seals, and recently constructed an artificial ledge in a marine cave to increase the number of caves available for pupping.

Efforts to reduce deaths due to fisheries interactions are being made for all the populations. Those efforts include restricting fishing activities in protected areas, use of alternative fishing gear, and education of fishers.

In 2005, the Working Group of the Mediterranean Monk Seal in the Eastern Atlantic (part of the Bonn Convention) developed an Action Plan for the Recovery of the Mediterranean Monk Seal (Monachus monachus) in the Eastern Atlantic. The plan reflects a shared, international commitment by Mauritania, Morocco, Portugal and Spain to ensure the recovery and persistence of the monk seals in the region. The plan focuses on several objectives, including 1) coordinating and funding conservation actions, 2) monitoring and research, 3) reducing human sources of mortality, 4) protecting critical habitats, and 5) educating the public.

To provide a framework for monk seal conservation efforts in Greece, in 2009 MOm updated an earlier monk seal action plan by preparing a new five-year National Strategy Action Plan for the Conservation of the Mediterranean Monk Seal in Greece. This plan adjusted priorities to emphasize protection of seals in the wild, habitat protection at national and local levels, developing a national network of protected areas, and strengthening measures to protect seals moving outside of and between protected areas. The plan calls for national legislation to strengthen legal authority for seal protection and to establish a National Monk Seal Conservation Commission. Other elements include a vigorous public awareness program targeting commercial fishers and tourists, a national inventory of important habitat sites, stronger management ties between local communities and user groups in designated protected areas, legally enforceable conservation measures that are applicable throughout national waters, and expanded scientific research.

Species Status

Abundance

Freshwater cetaceans (including six dolphin species and a porpoise) have declined dramatically in numbers and range, especially in Asia. The baiji (Lipotes vexillifer), a freshwater dolphin endemic to the Yangtze River in China, was declared extinct in 2006. The last verified sighting of this species occurred in 2002. Unsustainable bycatch in local fisheries likely drove this species to extinction.

Freshwater cetacean abundance is difficult to assess because populations are often broken up into different subpopulations, sometimes spanning multiple countries. Most populations, however, are thought to be declining and all are listed as endangered or critically endangered by the International Union for Conservation of Nature’s (IUCN’s) Red List of Threatened Species. For example, the boto (Inia geoffrensis), an endangered Amazon river dolphin, can be found in two river basins across six countries, from the river delta upstream to where the waters become impassible. There is no range-wide estimate for abundance or trend in abundance for this species, although they are generally thought to be declining. Monthly surveys have occurred in one section of the Brazilian Amazon since 1994 and have revealed a 6.7% annual decline in boto sightings from 2000 to 2017. In this same area, another Amazon river dolphin, the tucuxi (Sotalia fluviatilis), also appears to have declined by 7.4% annually from 1994 to 2017.

Distribution

Freshwater cetaceans can be found in South America, in the Amazon and Orinoco river basins in Brazil, Bolivia, Colombia, Ecuador, Peru, and Venezuela, and in Asia, throughout several river systems in China, India, Bangladesh, Nepal, Pakistan, Indonesia, Cambodia, and Myanmar. Historically, many of these species ranged from tidal deltas into lakes and tributaries far upriver. Waterfalls, rapids, and shallow water, as well as man-made structures like dams, can act as barriers to dolphin distribution. This often results in completely or partially isolated subpopulations of cetaceans throughout the river basin. Many freshwater dolphins prefer shallow, murky water, and as a result have evolved to have poor eyesight, instead relying on echolocation to navigate and locate prey.

Mekong River Population of Irrawaddy Dolphins

In January 2023, the Commission supported the travel of an expert group to Cambodia to work with WWF-Cambodia and the Fisheries Administration on their research and conservation efforts on Mekong River Irrawaddy dolphins, continuing an international collaboration underway for over a decade. The most recent population estimate in 2020 was 89 and there is concern over the number of animals lost from the population over the last few years, as 26 have been found dead since then. Commission Chair Gulland conducted necropsy training for the WWF staff and the river guards, focusing on the diagnosis of bycatch and specimen archiving. She has been involved with the local team since 2009, evaluating causes of death in the population. Jason Allen, from the Sarasota Dolphin Research Project of the Chicago Zoological Society, participated in a photo-identification survey of the current dolphin habitat and worked with the team on photo-id methodology and analysis, continuing training started during a Commission sponsored capacity building trip of the Cambodian team to Sarasota in 2018. Dr. Brian Smith of the Wildlife Conservation Society focused on the river guard and law enforcement situation and Ph.D. student Sarah Tubbs from Newcastle University engaged with the team on survey methods, exploring the use of acoustic detections in the river. The trip came at a time of intense focus on the dolphins in Cambodia, as three dolphins were found dead in fishing gear in late December, spurring the Prime Minister of Cambodia to call for increased protection from this primary threat to the existence of this population. Led by Executive Director Thomas, the visiting expert team met with the Cambodian Director General of Fisheries, the U.S. Ambassador to Cambodia, and the USAID mission team to draw attention to the need to take further action to protect this small population.

What the Commission Is Doing

The Marine Mammal Commission supports both targeted efforts to address the conservation of specific populations and regional efforts to strengthen freshwater cetacean conservation. Also, through its regular participation in the work of the International Whaling Commission Scientific Committee’s Sub-committee on Small Cetaceans, the Marine Mammal Commission seeks to make sure these “non-marine” marine mammals are given due consideration in accordance with their exceptional vulnerability.

Asia

In October 2009, the Commission co-sponsored a workshop in Samarinda, Indonesia, on Establishing Protected Areas for Asian Freshwater Cetaceans in Asia. Additionally, the Commission provided expertise to a meeting to draft an Indus River Dolphin (Platanista gangetica minor) Conservation Strategy and Action Plan, 2012 – 2022, held by WWF-Pakistan in Lahore, Pakistan, April 3-4, 2012. The Commission provided grant support to Gill Braulik for research on distribution, abundance, habitat use, and taxonomy crucial to understanding the conservation needs of the Indus River dolphin.

The Commission also participated in the Third Southeast Asian Marine Mammal Symposium (SEAMAM III) in Langkawi, Malaysia, from March 4-10, 2013. SEAMAM III considered issues related to the conservation and biology of coastal/inshore, estuarine and riverine marine mammals in Southeast Asia.

On December 9, 2014, an oil tanker collision spilled 350,000 liters of furnace oil into the waterways of the world’s largest mangrove forest in the Sundarbans, Bangladesh. This spill had the potential to impact the freshwater Ganges River dolphins (Platanista gangetica gangetica), as well Irrawaddy dolphins and finless porpoises (Neophocaena asiaeorientalis). In support of a joint United Nations/Government of Bangladesh Sundarbans oil spill response mission, the Commission funded Brian Smith and the Sundarbans biologists from the Wildlife Conservation Society to provide their expertise on the marine and freshwater cetacean species of the area and assist in the management of the spill and assessment of its impacts.

The Irrawaddy dolphin (Orcaella brevirostris) population in the Mekong River has been reduced to fewer than 100 individuals, primarily due to entanglement in fishing nets. The Commission has supported WWF-Cambodia and the government of Cambodia in bringing experts on marine mammal health, demography, and behaviour to the country to assist them in assessing the threats to this population and developing conservation strategies and on-the-ground capability in the areas of science, law enforcement and health assessment. In January 2017, the Cambodian fisheries agency reported on progress in removing gillnets from the core zone of the Mekong River dolphins. Subsequent to this workshop the Commission partnered with the Chicago Zoological Society to bring a team of Mekong dolphin researchers to Sarasota Florida for two weeks of exchange and capacity building with the Sarasota Dolphin Research Program. This was overshadowed by news of the proposed construction of the Sambor and Stung Treng hydropower dams. If built, these dams will eliminate or transform most of the dolphins’ remaining riverine habitat. In March 2020 the Government of Cambodia announced the welcome news of a ten-year moratorium on dam construction on the Mekong River mainstem and a shift to a focus on other renewable energy resources. WWF convened a virtual Trinational Workshop in December 2020 to review conservation efforts for the three Irrawaddy dolphin populations in Cambodia, Indonesia, and Myanmar and to update recommendations for action on the Mekong, Mahakam, and Ayeyarwady Rivers.

South America

Commission representatives participating in the Scientific Committee of the International Whaling Commission have worked in the Sub-Committee on Small Cetaceans to draw attention to the impact of the use of meat from the two Amazonian freshwater cetacean species, the boto (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis), for bait in the piracatinga catfish fishery. The government of Brazil responded to the recommendations of the Scientific Committee by placing a five-year ban on fishing for and marketing piracatinga in January 2015. Nevertheless there is strong evidence that the practice of using dolphins for bait continues and that much greater attention to this issue, and to other problems facing South American freshwater dolphins, is warranted.

Commission Reports and Publications

For more information on freshwater cetaceans, see Commission’s 2010–2011 annual report report and 2012 annual report.

Commission Letters

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Threats

The threats to freshwater cetaceans are diverse, longstanding, and difficult to assess and manage. Bycatch in fishing gear (entanglement or entrapment, usually leading to death) is the most serious and immediate problem for most populations, and gillnets are the greatest currently recognized cause of human-induced mortality. Freshwater cetaceans are also vulnerable to habitat modification and degradation (e.g., noise, chemical pollution, dams, lack of stream volume), and they compete with humans for prey. Vessel strikes, under-water explosions, the shock from electro-fishing, and entrapment in water management structures, notably irrigation canals, can cause injury or death. Some of these factors kill animals outright, and others impair their health or undermine their reproductive capabilities and social behavior. Unlike marine cetaceans, many freshwater animals live in environments where the very availability of water can be in doubt.

In freshwater (and estuarine) ecosystems, more so than in coastal or oceanic systems, such basic elements are finite and may be completely regulated, modified, or destroyed by human activities. The constricted nature of riverine habitat, and the inescapable need to share that habitat with humans, increases the vulnerability of these animals to bycatch in fisheries, overfishing of their prey, disturbance by noise, and being struck or displaced by vessels. In Brazil, Amazon River dolphins, or botos, and tucuxis are killed and used for bait in a fishery for a catfish, the piracatinga. Although most of the identified threats to freshwater cetaceans are widespread, and most freshwater cetacean populations face multiple threats, the types and intensity of human activities differ between different rivers. Nonetheless, in all cases, the human impact on river systems and on freshwater cetaceans is significant.

Current Conservation Efforts

The Commission continues its engagement on freshwater cetaceans both within the IWC’s Scientific Committee and through interactions with field researchers and conservationists in Asia and South America. The threats to freshwater cetaceans are ongoing and the impacts of human development need to be managed.

In 2017, the IWC formed the South Asian River Dolphin Task Team to assess the threats of habitat loss and bycatch to Ganges and Indus river dolphins. Scientists in India, Pakistan, and Nepal are working to coordinate efforts and develop a transnational plan to help conserve these species. The team is also working with the IWC’s Bycatch Mitigation Initiative to determine how future monitoring plans and alternative fishing gear technologies could reduce injury and death.

In 2021, the IWC adopted its first freshwater cetacean conservation management plan (CMP). The Amazon River Dolphin CMP was developed by the governments of Brazil, Colombia, Ecuador, and Peru. The plan outlines actions needed to assess dolphins range-wide and to identify and mitigate threats in the short and long term. The plan focuses on threats including deforestation, habitat fragmentation due to dams, mercury contamination, overfishing, bycatch, and climate change. It also focuses on using research to influence management and policy decisions. So far, over 45 botos have been tagged, mercury exposure and bycatch deterrent studies have been conducted, and a 2022-2023 workplan has been developed. Ongoing work includes determining how many species, subspecies, or subpopulations exist, identifying regional and national policies, and linking CMP goals with deforestation control.

Also in 2021, China passed a law to improve the protection and restoration of the Yangtze River basin. Many of the new measures will also promote the recovery of the Yangtze finless porpoise, including a ban on fishing in the Yangtze River and its tributaries for 10 years and a ban on the construction of chemical plants within 1km of the river. The IWC Scientific Committee recently highlighted the dire situation of the Yangtze finless porpoise which, without additional conservation efforts by the Chinese government, may follow the baiji to extinction in this heavily industrialized, densely populated river system.

In 2023, Cambodia’s prime minister ordered the creation of dolphin protection zones that prohibit fishing on the Mekong River. The Commission is encouraging further work on Irrawaddy dolphin conservation and behavior in the Mekong as enforcement efforts are strengthened there and is working to build support for efforts to understand and address threats to Irrawaddy dolphins in Myanmar and Indonesia.