Understanding Marine Mammal Protections
Learn how NOAA Fisheries protects all marine mammals under the Marine Mammal Protection Act.
Marine mammals are mammals that rely on the ocean to survive. They include whales, dolphins, porpoises, seals, sea lions, walruses, polar bears, sea otters, manatees, and dugongs. Some are fully aquatic, such as whales and dolphins. Others, such as seals and sea lions, spend most of their time in water but return to land or ice for activities such as resting or giving birth. Marine mammals are vital to the balance of marine ecosystems and are key indicators of the overall health of the ocean.
All marine mammals are protected under the Marine Mammal Protection Act. Some are also protected under the Endangered Species Act and the Convention on International Trade in Endangered Species of Wild Fauna and Flora.
With some exceptions, the MMPA prohibits the “take” of marine mammals—including harassment, hunting, capturing, collecting, or killing—in U.S. waters and by U.S. citizens on the high seas. The act also makes it illegal to import marine mammals and marine mammal products into the United States without a permit.
Our work to protect and conserve marine mammal species includes:
Managing the take of marine mammals through permits and authorizations (sections 101 and 104 of the MMPA).
Investigating and prosecuting violations of the MMPA (section 107).
Partnering with other nations to make sure they hold international fishing to our standards according to the MMPA (section 108).
Developing stock assessment reports—with scientific information on a species' or stock’s geographic range, population structure, abundance, and threats—to evaluate stock status (section 117).
Managing incidental marine mammal interactions with commercial fisheries through authorization and reporting, by assessing the level of mortality and injury in commercial fisheries, and by developing take reduction plans (section 118).
Investigating and responding to marine mammal unusual mortality events (section 404).
All marine mammal species found in U.S. waters are protected under the Marine Mammal Protection Act, as well as marine mammals listed as endangered or threatened under the Endangered Species Act worldwide. The MMPA prohibits, with certain exceptions, the "take" of marine mammals in U.S. waters and by U.S. citizens on the high seas, and the importation of marine mammals and marine mammal products into the United States.
NOAA Fisheries is charged with protecting whales, dolphins, porpoises, seals, and sea lions. Walrus, manatees, sea otters, and polar bears are protected by the U.S. Fish and Wildlife Service. The Marine Mammal Commission provides independent, science-based oversight of federal agencies’ policies and actions addressing human impacts on marine mammals and their ecosystems. Additionally, the Animal and Plant Health Inspection Service, under the Department of Agriculture, is responsible for regulations managing marine mammals in captivity under the Animal Welfare Act.
NOAA Fisheries scientists collect and analyze data on the marine mammal populations we manage. We gather information on a species' or stock’s population structure, life history characteristics and productivity rates, abundance, and threats—particularly those caused by human activities. We publish this information, and our analyses, in annual stock assessment reports.
The MMPA generally prohibits the "take" of marine mammals (e.g., harassment, hunting, capturing, collecting, or killing). The act also makes it illegal to import or export marine mammals and marine mammal products into or out of the United States without a permit or other applicable authorization. NOAA Fisheries authorizes take for certain activities, for example, scientific research, commercial and educational photography, and incidental take during commercial fishing operations and other non-fishery commercial activities like construction projects.
Fisheries bycatch is the greatest direct cause of marine mammal death and injury. To address this threat, NOAA Fisheries develops and implements take reduction plans—plans to mitigate marine mammal death and serious injury in commercial fisheries to help stocks recover. Teams of scientists, members of the fishing industry, representatives of environmental groups, and resource managers work together to develop these plans. The teams design each plan to reduce bycatch within a specific timeframe through a combination of voluntary and regulatory measures.
The MMPA prohibits killing or injuring marine mammals, except under certain circumstances. This program provides an annual exemption for the incidental mortality or injury of marine mammals that occurs during commercial fishing. This exemption does not include marine mammal stocks listed as endangered or threatened under the Endangered Species Act—incidental take of these species must be permitted separately.
Sometimes marine mammals are found in distress—sick, injured, or dead. The cause is often unknown, but sometimes it is shown to be disease, ship strikes, entanglements in marine debris or fishing gear, harmful algal blooms, pollution exposure, or other trauma. NOAA Fisheries works with trained partners in every coastal state to respond to reports of marine mammals in distress, assess the animals’ condition, and (in certain cases) try to rehabilitate or move them. If a marine mammal is dead, responders may perform a necropsy—an animal autopsy—to learn more. The valuable biological information collected during stranding responses helps us make better management decisions for marine mammal conservation. Marine mammals are mammals like us, and several species live in coastal waters that people use, and forage on some of the same fish that people consume. As such, they can help serve as indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health and welfare.
When marine mammal stranding rates are higher than usual, the MMPA sets out a process to evaluate strandings and determine whether they should be designated as unusual mortality events, which triggers a specific investigative response. UMEs can be caused by either natural or human factors, such as disease outbreaks, biotoxins from harmful algal blooms, oceanographic events, pollution, vessel strikes, and entanglement in fishing gear or marine debris.
Science is critical to understanding the needs and status of marine mammal populations, as well as the threats to their health and well-being. NOAA Fisheries pursues a scientific understanding of these topics because it is essential to conservation efforts. Examples of our work include assessing and monitoring marine mammal stocks, researching disease agents (e.g., pathogens, parasites, and harmful algal blooms), and developing gear modifications to reduce entanglement and bycatch.
The Marine Mammal Protection Act defines a marine mammal stock as a group of individuals “of the same species or smaller taxa in a common spatial arrangement that interbreed when mature.” Assessing stocks gives us valuable information on marine mammal population trends, productivity rates, estimates of human-caused mortality and other sources of serious injury, and more. It allows us to evaluate the effectiveness of conservation and recovery measures, and to adjust management approaches as needed.
Stock assessment reports for all marine mammals in U.S. waters were first required when the MMPA was amended in 1994. Since that time, all stocks have been reviewed at least every three years or as new information becomes available. Stocks that are designated as strategic are reviewed annually. Each draft stock assessment report is peer-reviewed by one of three regional Scientific Review Groups and revised and published after a public comment period.
Data collection, analysis, and interpretation are conducted through marine mammal research programs at each of our Fisheries Science Centers and by other researchers.
Ship-based and aerial surveys are critical to achieving our marine mammal population assessment goals, which include estimating abundance and examining trends and human impacts relative to management objectives. Our science centers conduct and manage a limited number of marine mammal surveys each year, often with external collaborators. The number of surveys depends on funding and available ship time and flight time.
The efficiency of sound travel under water has led to increasing concern over how artificial sound potentially impacts the underwater environment. Our scientists support and conduct research to examine these potential impacts on marine animals and to increase understanding of:
How marine animals use sound.
How underwater acoustics can be used to assess marine animal populations.
How and to what degree human activities are changing the underwater soundscape.
How these changes may potentially impact marine animals in their acoustic habitat.
What measures can be taken to mitigate potential impacts.
Understanding climate change impacts on living marine resource distribution and occurrence patterns is a high priority for NOAA Fisheries. We know relatively little about the effects of global and regional climate dynamics on species distribution, abundance, and prey availability. The Arctic in particular is a window to changing climate patterns and a suitable biological laboratory to observe and record the impacts of receding sea ice, warming sea surface temperatures, and variable energy flow. These impacts all affect key marine ecosystem functions and native tribal communities that depend on Arctic resources for their livelihood and sustenance.
Reducing bycatch of protected species can improve the recovery of marine mammals. Together with the fishing industry, we work to minimize bycatch by developing technological solutions and changes in fishing practices. These include gear modifications, avoidance programs, and/or improved fishing practices in commercial and recreational fisheries.
Marine mammal health is a key indicator of the overall health of our oceans. We and our stranding network partners perform vital research into causes of death and emerging diseases in marine mammals. This enables biologists to monitor the health of species populations and identify threats. They perform necropsies on freshly dead animals whenever possible. Blood serum, blubber, and tissue tests can provide information on contaminant loads and pathogens. During examinations, biologists also look for clues such as evidence of blunt force trauma (which can be an indicator of ship strikes) or signs of entanglement and fishery interactions. Data from stranding events are collected in a national database, and the information is used to increase our understanding of marine mammal communities and to monitor the health of their populations.
Marine mammals can often be identified by markings such as blemishes, fin nicks and notches, and scars. Several research programs rely on these markings—visible in images obtained during photo-identification surveys—to distinguish and catalog individual animals.
Species valuation studies enable us to assess the national benefits derived from protected species including marine mammals such as whales, porpoises, and sea lions. Protecting a species through laws and policies implies that society considers these species to be valuable. Economics can be used to assess the value that people have for preserving a species for future generations regardless of whether they ever view the species or not.
Learn about other advanced technologies used by our scientists—including drones, satellite tagging and tracking, and genetic research—to study marine mammals and other ocean animals.
Conservation groups; academia; tribal nations; and federal, state, and local governments all make important contributions to the protection and conservation of marine mammals. We collaborate with these organizations to minimize harmful effects on marine mammals and work toward their recovery. Together, we and our partners develop and implement conservation strategies, review and make recommendations on activities to help reduce harm to marine mammals, and provide grants to support marine mammal stranding response around the country. Some of our key partners in protecting marine mammals include:
Every year there are thousands of reports of stranded marine mammals throughout the United States. We rely on a national network of stranding responders to respond to these events, investigate, and collect valuable data. Stranding networks have been established in every coastal state and are largely volunteer. Through a national coordinator and five regional coordinators, NOAA Fisheries oversees, coordinates, and authorizes these activities and trains personnel.
Public contributions help fund some of our network partners, and some receive program funds from parent agencies or organizations. As network participants, they are eligible to compete for federal funds through the Prescott grant program to support special studies or supplement basic operations.
Co-management involves collaboration between the federal government and Alaska Native organizations to conserve marine mammal populations in Alaska.
Co-management efforts have integrated the field skills and traditional/indigenous knowledge of Alaska Native hunters with the scientific and technological expertise of NOAA scientists to better our understanding of marine mammals: their stock structure, status, trends, movement and habitat-use patterns, responses to climate change, animal health and condition, contaminants, and disease. Sampling of Native-harvested animals for scientific purposes (biosampling) has provided tissues for a variety of studies. Education and outreach efforts have trained hunters in good hunting practices and biosampling, and familiarized Alaska Native youth with cultural and subsistence traditions. Such efforts contribute significantly to marine mammal conservation and the maintenance of subsistence cultures.
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