North Atlantic Right Whale
About the Species
The North Atlantic right whale is one of the world’s most endangered large whale species; the latest preliminary estimate suggests there are fewer than 350 remaining. Two other species of right whales exist: the North Pacific right whale, which is found in the North Pacific Ocean, and the Southern right whale, which is found in the southern hemisphere. Right whales are baleen whales, feeding on copepods (tiny crustaceans) by straining huge volumes of ocean water through their baleen plates, which act like a sieve.
By the early 1890s, commercial whalers had hunted North Atlantic right whales to the brink of extinction. (They got their name from being the "right" whales to hunt because they floated when they were killed.) Whaling is no longer a threat, but they have never recovered to pre-whaling numbers, and human interactions still present the greatest danger to this species. Entanglement in fishing gear and vessel strikes are the leading causes of North Atlantic right whale mortality. Increasing ocean noise levels from human activities are also a concern since the noise may interfere with right whale communication and increase their stress levels.
NOAA Fisheries and our partners are dedicated to conserving and rebuilding the North Atlantic right whale population. We use a variety of innovative techniques to study, protect, and recover these endangered whales. We engage our partners, including the fishing and shipping industries, as we develop regulations and management plans that foster healthy fisheries and reduce the risk of entanglements, slow down vessel traffic, and reduce ocean noise.
North Atlantic right whales have been listed as endangered under the Endangered Species Act since 1970. The latest preliminary estimate suggests there are fewer than 350 remaining, with fewer than 100 breeding females. The number of new calves born in recent years has been below average.
They have experienced an ongoing Unusual Mortality Event since 2017. Thirty-four North Atlantic right whales have been documented dead and 20 seriously injured. This represents more than 10 percent of the population, which is a significant impact on an endangered species where deaths are outpacing births.
- Throughout Its Range
- Throughout Its Range
- Throughout Its Range
CITES Appendix I
- Throughout Its Range
SPAW Annex II
- Throughout the Wider Caribbean Region
North Atlantic right whales have stocky black bodies with no dorsal fins, and their blow spouts are shaped like a “V.” Their tails are broad, deeply notched, and all black with a smooth trailing edge. Their bellies may be all black or have irregularly shaped white patches. Pectoral flippers are relatively short, broad, and paddle-shaped. Calves are about 14 feet at birth and adults can grow to lengths of 52 feet.
Their heads have knobby white patches of rough skin, called callosities, which appear white because of whale lice (cyamids) covering their otherwise black skin. Each right whale has a unique pattern of callosities that scientists use to identify individual whales, an invaluable tool in tracking population size and health. Aerial and ship-based surveys and the North Atlantic Right Whale Consortium’s photo-identification database maintained by our partners at the New England Aquarium help track individuals over the years.
Behavior and Diet
When viewing right whales, you might see these enormous creatures breaching and then crashing back down with a thunderous splash. You might also see them swimming along with their rostrum out of the water as they skim feed on dense patches of plankton. Right whales feed by opening their mouths while swimming slowly through large patches of copepods and other zooplankton. They filter out these tiny organisms from the water through their baleen, where the copepods become trapped in a tangle of hair-like material that acts like a sieve. Right whales feed anywhere from the water’s surface to the bottom of the water column.
Groups of right whales may be seen actively socializing at the water’s surface, known as surface-active groups, or SAGs. Mating and socializing occurs in SAGs, which are observed during all seasons and in all habitats.
Right whales communicate using low-frequency moans, groans, and pulses, which may maintain contact between individuals, communicate threats, signal aggression, or be used for other social reasons.
Where They Live
North Atlantic right whales primarily occur in Atlantic coastal waters on the continental shelf, although they also are known to travel far offshore, over deep water.
Right whales migrate seasonally and may travel alone or in small groups. In the spring, summer, and into fall, many of these whales can be found in waters off New England and further north into Canadian waters, where they feed and mate.
Each fall, some right whales travel more than 1,000 miles from these feeding grounds to the shallow, coastal waters of their calving grounds off of South Carolina, Georgia, and northeastern Florida, though migration patterns vary.
NOAA Fisheries has designated two areas as critical habitat for North Atlantic right whales. These areas provide important feeding, nursery, and calving habitat:
- Off the coast of New England (foraging area)
- Off the southeast U.S. coast from Cape Fear, North Carolina, to below Cape Canaveral, Florida (calving area)
Lifespan & Reproduction
Right whales can probably live for at least 70 years, but data on their average lifespan is limited since scientific monitoring of the species is fairly recent. Ear wax can be used to estimate age in right whales after they have died. Another way to determine lifespan is to look at groups of closely related species. There are indications that some species closely related to right whales may live more than 100 years. However, female North Atlantic right whales are now only living to around 45 years old and males only to around 65 years old. Such reduced lifespans are due to human-caused mortality, not old age.
In recent years, researchers have recorded more deaths among adult females than adult males, leading to a population with more males than females, a bias that is increasing over time. Females that undergo energetic stress from reproduction may be more susceptible than males to dying from chronic injuries such as those from entanglement or vessel strikes.
Female right whales become sexually mature at about age 10. They give birth to a single calf after a year-long pregnancy. Three years is considered a normal or healthy interval between right whale births. But now, on average, females are having calves every 6 to 10 years. Biologists believe that the additional stress caused by entanglement is one of the reasons that females are calving less often.
North Atlantic right whales face many threats, including entanglement in fishing gear, vessel strikes, climate change—which may alter their migratory patterns and feeding areas—and the impacts of ocean noise on their ability to communicate, find food, and navigate.
Entanglement in fishing gear is one of the greatest threats to North Atlantic right whales. NOAA Fisheries and our partners estimate that over 85 percent of right whales have been entangled in fishing gear at least once. Fishing gear can cut into a whale’s body, cause serious injuries, and result in infections and mortality. Even if gear is shed or removed through disentanglement efforts, the time spent entangled can severely stress a whale, weaken it, prevent it from feeding, and sap the energy it needs to swim, feed, and reproduce. Chronic entanglements are one reason scientists think that female right whales are having fewer calves and are taking longer to have calves.
Vessel strikes are another major threat to right whales. Their habitat and migration routes are close to major ports along the Atlantic coastline and often overlap with shipping lanes, making right whales vulnerable to collisions with vessels. These collisions can cause broken bones and massive internal injuries or cuts from propellers. Vessels of nearly any size can injure or kill a right whale. The faster a vessel is traveling when it hits a whale, the higher the likelihood of serious injury or death.
The changing climate, and more specifically oceanographic changes in the Northwest Atlantic, are key factors contributing to reduced reproduction and higher susceptibility to human-caused threats. Over the past decade, right whales have changed their distribution patterns, likely in response to changes in prey location and availability due to warming oceans. As their prey moved, the whales began spending more time in areas with fewer protections from vessel strikes and entanglements.
A dip in right whale births and lengthened calving intervals (from 3 to 5 years to 6 to 10 years) indicates that reproductively active females have struggled in recent years to find sufficient food resources to support pregnancy. As their environment changes, right whales will likely continue to modify their distribution and behavior to adapt, resulting in a more uncertain and unpredictable future for the species.
Ocean noise from human activities such as shipping, boating, construction, and energy exploration and development has increased in the Northwest Atlantic. Noise from these activities can interrupt the normal behavior of right whales and interfere with their communication. It may also reduce their ability to detect and avoid predators and human hazards, navigate, identify physical surroundings, find food, and find mates.
Road to Recovery
Endangered North Atlantic right whales are approaching extinction. The latest preliminary estimate indicates there are fewer than 350 individuals remaining and less than 100 breeding females. Primary threats to the species are entanglement in fishing gear and vessel strikes. Climate change is also affecting every aspect of their survival—changing their ocean habitat, their migratory patterns, the location and availability of their prey, and even their risk of becoming entangled in fishing gear or struck by vessels.
The North Atlantic Right Whale Road to Recovery describes NOAA Fisheries’ efforts to halt the current population decline and recover the species. It is built on the foundation of the statutory requirements that we are charged with implementing under the Endangered Species Act and the Marine Mammal Protection Act. It shows how our collective actions, in collaboration with partners, fit together to save this iconic species. The strategy complements the North Atlantic right whale 2021–2025 Priority Action Plan by identifying our goals and related objectives, and by tracking and communicating progress on major activities and associated milestones, examples of which are given below. The Road to Recovery is a living information resource and will be updated regularly.
The efforts that pave the way on the Road to Recovery are only possible with the support and collaboration of many partners, such as the Marine Mammal Commission and Canada (see the 2021-2025 Priority Action Plan and Recovery Plan).
Goal: Address Threats to the Species
For endangered North Atlantic right whales to recover, we must address existing and emerging threats to the species. To achieve this goal, the Road to Recovery focuses on three objectives: address vessel strikes, address fishing gear entanglements, and address potential and emerging threats, including impacts from climate change, new and expanded ocean uses, and ocean noise.
North Atlantic right whales are sometimes referred to as the "urban whale" due to their proximity to populated, coastal environments. This proximity leads to strikes from vessels moving through these waters, resulting in injury or death. Reducing vessel strikes is necessary to mitigate extinction risk.
Example Activities and Milestones
- Establishing vessel speed regulations and recently proposed modifications
- Enforcing vessel speed regulations to promote compliance
- Conducting public outreach and engagement to raise awareness on vessel strike risk such as the 2021-2022 calving season campaign through web stories, visualizations, and social media posts
Fishing Gear Entanglements
North Atlantic right whales breed, feed, and travel through prime fishing grounds along the East Coast of North America. This leads to incidental entanglements in fishing gear, often resulting in injury or death. Reducing entanglement is necessary to mitigate extinction risk.
Example Activities and Milestones
- Working with stakeholders, such as the Atlantic Large Whale Take Reduction Team, on measures to mitigate entanglements, most recently by implementing Phase 1 of the Atlantic Large Whale Take Reduction Plan Modifications and issuing an April 2022 emergency closure for lobster and Jonah trap/pot fishery in a specific area important to right whales
- Committing to the North Atlantic Right Whale Conservation Framework to further reduce entanglements in federally permitted fisheries in the Greater Atlantic Region through 2030
- Collaborating with fishermen to develop and test innovative fishing gear that has informed our draft Ropeless Roadmap
Potential and Emerging Threats
As human activities and environments change, right whales may face additional potential and emerging threats—including impacts from climate change, new and expanded ocean uses, and ocean noise. Assessing and mitigating threats associated with climate change, development of offshore wind, expansion of aquaculture, and increased ocean noise are necessary to mitigate extinction risk.
Example Activities and Milestones
- Developing the Climate Science Strategy, including the Northeast Regional Action Plan highlighting North Atlantic right whales, and recently publishing a 5-year progress report
- Conducting right whale scenario planning and publishing the related 2020 North Atlantic Right Whale Scenario Planning Summary Report
- Establishing NOAA’s Ocean Noise Strategy and publishing an associated Ocean Noise Strategy Roadmap
- Working with the Bureau of Ocean Energy Management to develop a science and management strategy to promote right whale recovery while responsibly developing offshore wind energy
- Working with the Bureau to draft a strategy for mitigating the impact of offshore wind energy development on NOAA Fisheries surveys, including right whale surveys
- Completing Marine Mammal Protection Act and Endangered Species Act authorizations and consultations, respectively, for South Fork Wind and Vineyard Wind 1 that required specific measures to minimize impacts to right whales
Goal: Monitor Recovery Progress
Monitoring is crucial to track the status of right whales and evaluate the effectiveness of our efforts to address threats. To achieve this goal, the Road to Recovery focuses on three objectives: monitor population and health, monitor threats, and monitor effectiveness of conservation.
Monitor Population and Health
Long-term monitoring of the population and health is critical for tracking the status of North Atlantic right whales over time. It provides an understanding of individual health and reproduction as well as distribution, abundance, and habitat-use patterns of the population.
Example Activities and Milestones
- Conducting annual aerial surveys and publishing survey reports
- Collecting data through acoustic monitoring, which we analyze and share on the Passive Acoustic Cetacean Map
- Convening workshops to optimize monitoring and health assessment efforts such as the 2019 Health Assessment Workshop and Monitoring and Surveillance Workshop
- Conducting and publishing annual stock assessment reports
With changing ocean conditions and human activities, it is crucial to continually monitor threats to the species.
Example Activities and Milestones
- Tracking and investigating right whale injuries and deaths, including those in the ongoing Unusual Mortality Event and publishing annual mortality and serious injury reports
- Working with the marine mammal stranding and entanglement response networks through annual coordination and support from the Marine Mammal Health and Stranding Response Program and its Prescott Grant Program, National Stranding Database, and stranding reports
- Tracking changes in ocean conditions, marine development activities, commercial fishing operations, and vessel traffic—informing a recent coast-wide assessment of right whale vessel strike risk
Monitor Effectiveness of Conservation
To ensure our conservation efforts are effective, we regularly evaluate existing conservation efforts and seek means for improvement.
Example Activities and Milestones
- Evaluating the effectiveness of vessel strike reduction measures, such as the analysis conducted in the 2020 Vessel Speed Rule Assessment Report
- Working with the Atlantic Large Whale Take Reduction Team to regularly assess the effectiveness of existing fisheries mitigation measures and the need to further reduce entanglements in U.S. commercial fisheries
- Evaluating the effectiveness of mitigation and monitoring measures included in incidental take authorizations and consultations on activities other than commercial fishing like military training exercises, energy activities, and coastal development projects
- Working with the Northeast Implementation Team and Southeast Implementation Team to coordinate regional recovery efforts and monitoring progress related to the Recovery Plan
In the Spotlight
The North Atlantic right whale is NOAA Fisheries' newest Species in the Spotlight. This initiative is a concerted, agency-wide effort launched in 2015 to spotlight and save marine species that are among the most at risk of extinction in the near future.
North Atlantic right whales have been experiencing a population decline for more than a decade.
NOAA and our partners are continuing to prioritize stabilizing and preventing extinction of this species, and the Species in the Spotlight designation helps focus resources on these many efforts.
NOAA's Commitment to Right Whale Recovery
As the federal agency charged with recovering the North Atlantic right whale, we are committed to recovering the species by significantly reducing risks from entanglement in fishing gear and vessel strikes. The Marine Mammal Protection Act provides a structure, through the Take Reduction Process, for stakeholder voices to be heard and the opportunity for entanglement risk reduction innovation to come from the people who will be most affected by future regulatory action. Under the Endangered Species Act, we manage the threats that North Atlantic right whales face, including the risks of vessel strikes, to facilitate their recovery.
Species in the Spotlight Priority Actions
We developed a Species in the Spotlight 2021–2025 Priority Action Plan that builds on the recovery plan and details the focused efforts that are needed from 2021 to 2025. The identified priorities incorporate input from our North Atlantic Right Whale Northeast and Southeast U.S. Implementation Teams. These actions include:
- Protecting right whales from entanglement in fishing gear
- Protecting right whales from vessel strikes
- Investigating population abundance, status, distribution and health
- Collaborating with Canada on right whale recovery
- Improving our knowledge of additional factors limiting recovery
While North Atlantic right whales were only added to the Species in the Spotlight initiative in 2019, we have been working with our partners on helping this species’ recovery for two decades. A number of crucial steps we have taken to stop their decline since the Species in the Spotlight designation includes:
- In 2019, we reconvened the Atlantic Large Whale Take Reduction Team, and are in the process of developing a new rule to reduce fishing gear entanglements expected to be in place in 2021.
- We announced a new “Right Whale Slow Zones” campaign in the Northeast U.S. asking all vessel operators to slow down or avoid areas for a 15-day period when right whales meet a visual or acoustic detection trigger.
- In 2020, we released a North Atlantic Right Whale Vessel Speed Rule Assessment report (PDF, 53 pages) that assessed the effectiveness of the 2008 vessel speed rules, and are accepting comments on the report through March 26, 2021.
- We have been working closely with fishermen on the development and testing of ropeless fishing gear for use in New England trap/pot fisheries.
- We are collaborating with Fisheries and Oceans Canada and Transport Canada on all matters related to the transboundary reduction of vessel strike and entanglement mortalities and serious injuries of North Atlantic right whales.
These are just some examples of the work we are doing.
For information on our many efforts, including our recovery plan, implementation teams, critical habitat designations, vessel strike reduction, fishing gear entanglement reduction, and stranding responses, to help North Atlantic right whales recover, visit our conservation and management page.
North Atlantic right whales are approaching extinction. Unless immediate action is taken to substantially reduce human-caused mortality and injury, the number of North Atlantic right whales will continue to decline, imperiling the species’ ability to recover.
NOAA Fisheries and its partners are committed to protecting and recovering North Atlantic right whales through conservation, regulatory, rescue, and enforcement measures.
Reducing Vessel Strikes
Collisions between whales and large vessels often go unnoticed and unreported, even though whales can be injured or killed and vessels can sustain damage. Collisions with boats as small as 30 feet in length can be lethal to right whales, especially calves, and dangerous for boat passengers. The most common vessel-related injuries to right whales are blunt force trauma and propeller cuts.
We have taken steps to reduce the threat of vessel collisions to North Atlantic right whales, including:
- Requiring vessels to slow down in specific areas, known as Seasonal Management Areas, during specific times
- Implementing voluntary speed reductions in Dynamic Management Areas and Right Whale Slow Zones
- Implementing a 500-yard “no-approach” safety zone around right whales
- Recommending alternative shipping routes and areas to be avoided
- Modifying international shipping lanes
- Developing right whale alert systems
- Developing mandatory vessel reporting systems
- Increasing outreach and education
- Improving our stranding response
Vessel Speed Restrictions
The most effective way to reduce collision risk is to keep whales and vessels apart. If that is not possible, the next best option is for vessels to slow down and keep a lookout. The slower a vessel travels, the more time the whale has to get out of the way, and the less likely a collision is to result in serious injury or death.
In Seasonal Management Areas, along the U.S. East Coast, most vessels 65 feet or longer must slow to 10 knots or less during times of the year when right whales are likely to be present. Failure to comply with speed restrictions results in fines.
Outside of these areas, if three or more right whales are sighted within close proximity, we implement a temporary voluntary speed reduction area called Dynamic Management Areas. In the Northeast, we also implement similar measures known as Right Whale Slow Zones when right whales are detected by underwater acoustic receivers.
Unfortunately, a recent analysis found that cooperation with these voluntary measures is low, indicating they may not be sufficient to meaningfully reduce vessel collisions.
Some states also regulate vessels to help minimize impacts. The Massachusetts Division of Marine Fisheries requires all vessels (including those less than 65 feet) to travel at speeds no greater than 10 knots in Cape Cod Bay during specific times of the year.
Mandatory Vessel Reporting System
To further reduce the number of vessel strikes, NOAA Fisheries and the U.S. Coast Guard developed and implemented a mandatory vessel reporting system for North Atlantic right whales. When large vessels enter one of two key right whale habitats—feeding areas off the U.S. northeast coast and calving habitat off the U.S. southeast coast—they must report to a shore-based station. The vessel then receives a message about right whales, their vulnerability to vessel strikes, precautionary measures to avoid hitting a whale, and locations of recent sightings.
Right Whale Sighting Advisory System
To reduce vessel collisions, mariners are urged to use caution and proceed at safe speeds in areas where right whales are likely to be found. NOAA Fisheries and our partners developed an interactive mapping application. It provides real-time information on North Atlantic right whale sightings along the U.S. East Coast and in Canada.
Entanglement in fishing gear is a primary cause of mortality and serious injury for some whale species, including the North Atlantic right whale. Fishing gear, especially vertical line rope in the water column, can wrap around a whale, cut into its body, and cause serious injuries and death. Even gear that is removed through disentanglement efforts or falls off can severely stress a whale, weaken it, prevent it from feeding, and sap the energy it needs to swim, feed, and reproduce. The Atlantic Large Whale Take Reduction Team is a group of fishermen, scientists, conservationists, and state and federal officials that provides recommendations on how to reduce entanglements in U.S. commercial fisheries. We use those recommendations to develop management measures to reduce whale entanglements.
Specifically, we have taken these steps to reduce the threat of entanglement to North Atlantic right whales:
- Implementing seasonal closures to fixed gear commercial fisheries in areas where right whales are known to aggregate
- Requiring weak inserts or weak rope in fixed gear fisheries fishing to increase the likelihood that right whales can break free of buoy lines and gillnet panels
- Requiring fewer vertical buoy lines in trap/pot fisheries (known as trawling up) in areas where right whales occur
- Requiring sinking ground line (versus floating) between trap/pots and gillnet anchoring systems
- Mandating gear marking to improve our understanding of where and how right whales become entangled
- Increasing outreach and education
- Improving our stranding response
We are actively working with fishermen and manufacturers to test “on-demand,” or ropeless fishing gear, which will provide a future solution to prevent large whale entanglement.
When entangled whales are reported anywhere along the U.S. East Coast, the NOAA-supported Atlantic Large Whale Disentanglement Network is called upon to try to help. The network is made up of emergency responders from 20 public and private organizations who have extensive training in how to disentangle large whales and increase their odds of surviving. The Network has successfully disentangled almost 30 North Atlantic right whales over the years.
Examining gear removed from entangled animals is one of the key ways for us to determine whether regulations are working and fishing gear modifications are effective.
Overseeing Marine Mammal Health and Stranding Response
We work with volunteer networks in all coastal states to respond to marine mammal strandings. When stranded animals are found alive, NOAA Fisheries and our partners assess the animal’s health. When stranded animals are found dead, our scientists work to understand and investigate the cause of death. Although the cause often remains unknown, scientists can sometimes identify strandings caused by vessel strike, entanglement, disease, harmful algal blooms, pollution exposure, and underwater noise. Some strandings can serve as indicators of ocean health, giving insight into larger environmental issues that may also have implications for human health and welfare.
Addressing Ocean Noise
Underwater noise threatens marine animal populations, interrupting their normal behavior and driving them away from areas important to their survival. NOAA Fisheries is investigating all aspects of acoustic communication and hearing in marine animals, including the effects of sound on whale behavior and hearing. In 2016, we issued technical guidance for assessing the effects of human-made sound on marine mammals’ hearing.
Marine Mammal Unusual Mortality Events
There is an ongoing Unusual Mortality Event for North Atlantic Right Whales. An unusual mortality event is "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." Scientists carefully study unusual mortality events to determine the cause of these events and better understand the health of marine mammal populations.
NOAA Fisheries collaborates with Canada through bilateral discussions on science and management efforts needed to recover North Atlantic right whales. It is crucial for both countries to take and sustain additional efforts to reduce right whale mortalities and serious injuries. Risk reduction measures and whale-safe maritime practices must be a shared responsibility. For example, we share innovative techniques and solutions that reduce risk to right whales while fostering healthy fisheries.
Under the Endangered Species Act, NOAA Fisheries is required to develop and implement recovery plans for the conservation and survival of listed species. The ultimate goal of the North Atlantic Right Whale Recovery Plan is to recover the species, with an interim goal of improving its status from endangered to threatened.
The major actions recommended in the plan are:
- Reduce or eliminate injury and mortality caused by vessel collisions and fishing gear
- Protect habitats essential to the survival and recovery of the species
- Minimize the effects of vessel disturbance
- Continue the international ban on whaling
- Monitor the population size and trends in abundance of the species
- Maximize efforts to free entangled or stranded right whales and acquire scientific information from dead specimens
Recovery Plan Implementation
Critical Habitat Designation
NOAA Fisheries designated critical habitat for the North Atlantic right whale under the Endangered Species Act in 1994 and revised the designation in 2016 to support the species’ recovery. Critical habitat for the North Atlantic right whale includes two areas—a foraging area in the Northeast and a calving area in the Southeast.
Key Actions and Documents
Incidental Take Authorization: Attentive Energy LLC Marine Site Characterization Surveys off of New Jersey and New York
Incidental Take Authorization: Atlantic Shores Offshore Wind Bight, LLC Marine Site Characterization Surveys off of New Jersey and New York
Incidental Take Authorization: Park City Wind, LLC New England Wind Project, Phase 1, Marine Site Characterization Surveys off of Massachusetts to New
Incidental Take Authorization: Vineyard Northeast, LLC Marine Site Characterization Surveys off of Massachusetts to New Jersey
NOAA Fisheries conducts various research activities on the biology, behavior, and ecology of the North Atlantic right whale. The results of this research are used to inform management decisions and enhance recovery efforts for this endangered species.
We use a variety of methods to determine where right whales are located, including surveys with boats and planes, underwater acoustic listening devices, habitat modeling, and citizen science sighting reports. To better inform the public of the most recent right whale sightings, NOAA scientists maintain a database that displays real-time sightings on an interactive map. These data, along with those maintained by our partners at the New England Aquarium, includes more than 40 years of reliable sightings data, spanning the entire range of the species from Canada through Florida.
NOAA is working hard to develop a tag that will stay attached to right whales without compromising the health of these animals given their precarious state and poor condition. Right whales are especially challenging to keep long term tags attached since they often engage in physical contact with each other, putting tremendous stress on tags attached to their bodies. They also lack a dorsal fin which is a commonly used attachment point in other species.
Scientists use small aircraft to spot North Atlantic right whales and photograph them to identify individuals and record their seasonal distribution. Understanding the whales’ distribution patterns helps managers establish measures to reduce vessel strikes and fisheries interactions. NOAA Fisheries and our partners also use small unmanned aircraft systems (drones) to assess individual right whale size and body condition, as well as taking breath samples to analyze factors such as genetics and stress hormones.
In addition to aerial surveys, we conduct vessel surveys that investigate the whales’ habitat preferences and feeding ecology, as well as collect photographic and genetic identification. Information from this research can be used to inform management actions that protect the North Atlantic right whale.
As with our aerial surveys, the goals of many shipboard surveys are to photograph as many individual right whales as possible, so we concentrate on places where we are most likely to find them at the surface, aggregating to feed or engage in social behaviors. This helps us accurately estimate the population size and monitor population trends. The photographs and other data collected (time, date, location, behavior) are used by researchers to investigate things like body condition, behavior, and life history. Over time, these data can also reflect changes in distribution.
If the whales aren’t feeding or socializing at the surface, their behavior can make them hard to spot (for example, if they’re engaged in deep dives or traveling while submerged). Sea state and weather also make it more challenging to spot whales.
Acoustics is the science of how sound is transmitted. This research involves increasing our understanding of the basic acoustic behavior of whales, dolphins, and fish; mapping the acoustic environment; and developing better methods using autonomous gliders and passive acoustic arrays to locate cetaceans.
We use underwater microphones to listen for right whale calls. This is another way to learn more about where and when these whales are present in different areas (at least during times they are vocalizing) where visual surveys are not likely to be effective. For example, acoustic detections have shown that at least some right whales can be detected year-round in locations we thought were once only seasonally used.
Other research is focused on the acoustic environment of cetaceans, including North Atlantic right whales.
Determining the size of the North Atlantic right whale population—and whether it is increasing or decreasing from year to year—helps resource managers assess the success of the conservation measures enacted. Our scientists collect population information on right whales from various sources and present the data in an annual stock assessment report.
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