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Species Directory

Harp Seal

Overview Conservation & Management Science
Harp seals live throughout the cold waters of the North Atlantic and Arctic Oceans. These seals are named after the black patch on their back, which looks like a harp.

Harp Seal

Pagophilus groenlandicus

Harp seal illustration. Credit: Jack Hornady

Protected Status

MMPA Protected
Throughout Its Range

Quick Facts

Weight
About 260 to 300 pounds
Length
About 5 to 6 feet
Lifespan
Unknown
Threats
Hunting, Vessel strikes, Entanglement, Habitat degradation, Overfishing, Chemical contaminants, Oil spills and energy exploration, Climate change
Region
New England/Mid-Atlantic
In the foreground an adult harp seal and pup on ice. Big chunks of ice can be seen in the background. An adult harp seal and pup on ice - Photo: NOAA Fisheries

An adult harp seal and pup on ice - Photo: NOAA Fisheries

About the Species

In the foreground an adult harp seal and pup on ice. Big chunks of ice can be seen in the background. An adult harp seal and pup on ice - Photo: NOAA Fisheries

An adult harp seal and pup on ice - Photo: NOAA Fisheries

Harp seals live throughout the cold waters of the North Atlantic and Arctic Oceans. Three populations in the Barents Sea, East Coast of Greenland, and Northwest Atlantic Ocean are recognized based on geographic distribution as well as morphological, genetic, and behavioral differences. These seals are named after the black patch on their back, which looks like a harp.

Harp seals gather in large groups of up to several thousand to molt and breed. Although they live in cold water, harp seal pups are born without any protective fat. Newborns quickly develop a thick layer of blubber while nursing. 

Harp seals, like all marine mammals, are protected under the Marine Mammal Protection Act. NOAA Fisheries is committed to conserving and protecting harp seals. Our scientists and partners use a variety of innovative techniques to study, learn more about, and protect this species.

Population Status

To manage harp seals in U.S. waters, we have grouped them into western North Atlantic stock. Based on the most recent survey, our scientists estimate that there are about 7 million seals in this stock, making them the most abundant marine mammal in the North Atlantic. 

Learn more about our estimates for population size in our stock assessment reports

Appearance

Harp seals are part of the true seal family. All true seals have short flippers, which they use to move in a caterpillar-like motion on land. They do not have external ear flaps. 

Harp seals are about 5 to 6 feet long, weigh about 260 to 300 pounds, and have a robust body with a small, flat head. They have a narrow snout and eight pairs of teeth in both the upper and lower jaws. Their front flippers have thick, strong claws, while their back flippers have smaller, narrower claws. 

Adult harp seals have light gray fur with a black mask on their face and a curved black patch on their back. This black patch looks like a harp and is the source of the species’ common name. Some animals have dark spots randomly scattered over their entire body. Adults molt, or shed, their fur every spring. 

Harp seal pups have long, wooly, white fur known as lanugo, that lasts until about 3 to 4 weeks old. This white fur helps absorb sunlight and trap heat to keep the pups warm. Pups molt several times during their development.

Behavior and Diet

Harp seals gather on pack ice in large groups during breeding and molting seasons. These groups can contain up to several thousand seals. Harp seals also feed and travel in large groups during seasonal migrations. They often travel away from the pack ice during the summer and follow the ice north to feed in the Arctic. Annual migrations can be more than 3,100 miles roundtrip.

Harp seals can dive up to 1,300 feet below the surface and remain underwater for about 16 minutes. They eat a variety of fish and invertebrates (more than 130 species). Some seals have been found with more than 65 species of fish and 70 species of invertebrates in their stomachs. The most common prey species include smaller fish such as capelin, Arctic cod, and polar cod.

Lifespan & Reproduction

The maximum lifespan of a harp seal is approximately 30 years. Males are sexually mature at seven to eight years of age and females at four to seven years of age. Females give birth from late February through mid-March. They will only give birth during the short period of time when pack ice is available, as the ice provides a place to nurse their pups. 
 At birth, newborn harp seals weigh about 25 pounds and are about 3 feet long. They nurse on high-fat milk for about 12 days. During this time, they gain about 5 pounds per day and develop a thick blubber layer. Harp seals wean when they reach around 80 pounds. 
 After weaning, adult females leave their pups on the pack ice. The pups stay on the ice without eating for about six weeks. They can lose up to half of their body weight before they enter the water and start feeding on their own.

Threats

Hunting

Commercial hunters have captured harp seals in Canada for meat and oil since the 1600s. The Canada Department of Fisheries and Oceans sets an annual total allowable catch for commercial, aboriginal, and personal use hunting. Hunting also occurred in Greenland.

Vessel Strikes

Inadvertent vessel strikes can injure or kill harp seals. Harp seals are vulnerable to vessel collisions throughout their range, but the risk is much higher in some coastal areas with heavy ship traffic. 

Entanglement

Harp seals can become entangled in fishing gear and other types of marine debris. Entanglement occurs when animals swim with gear attached or  if they become anchored. They can become entangled in many different gear types, including gillnets, trawls, purse seines, or weirs. Once entangled, seals may drown if they cannot reach the surface to breathe, or they may drag and swim with attached gear for long distances, ultimately resulting in fatigue, compromised feeding ability, or severe injury, which may lead to reduced reproductive success and death.

Chemical Contaminants 

Contaminants enter ocean waters from many sources, including oil and gas development, wastewater discharges, urban runoff, and other industrial processes. Once in the environment, these substances move up the food chain and accumulate in predators near the top, such as harp seals. Because of their blubber stores, harp seals accumulate these contaminants in their bodies, threatening their immune and reproductive systems.

Oil Spills and Energy Exploration 

Offshore oil and gas exploration and development also have the potential to impact harp seals. The most significant risk posed by these activities is the accidental or illegal discharge of oil or other toxic substances due to their immediate and potentially long-term effects. If exposed to oil, a harp seal’s fur can no longer repel water. This makes it difficult for the seal to swim, float, and keep warm. Inhaling or swallowing oil can damage a seal’s respiratory, digestive, reproductive, and central nervous systems. Oil can also irritate or burn the seal’s skin. 

Climate Change

Harp seals rely on the availability of suitable sea ice as a haul-out platform for giving birth, nursing pups, and molting. As such, harp seals are sensitive to changes in the environment that affect the timing and extent of sea ice formation and breakup. 

Scientific Classification

Kingdom Animalia
Phylum Chordata
Class Mammalia
Order Carnivora
Family Phocidae
Genus Pagophilus
Species groenlandicus

Last updated by NOAA Fisheries on 04/10/2025


What We Do

Conservation & Management

NOAA Fisheries is committed to the protection of harp seals. Targeted management actions taken to secure protections for these seals include:

  • Reducing vessel strikes.
  • Implementing oil spill response plans in the event of a spill.
  • Overseeing marine mammal health and stranding response.
  • Engaging stakeholders and the public to increase awareness about harp seals.
Learn more about our conservation efforts

Science

Our research projects have discovered new aspects of harbor seal biology, behavior, and ecology and have helped us better understand the challenges that all harp seals face. Our work includes

  • Stock assessments.
  • Monitoring population abundance and distribution.
Learn more about our research

How You Can Help

A circular graphic showing a pair of binoculars with the image of a seal in the lens

Keep Your Distance

Be responsible when viewing marine life in the wild. Observe all seals and sea lions from a safe distance of at least 50 yards and limit your time spent observing to 30 minutes or less.

Learn more about our marine life viewing guidelines

Marine Life In Distress

Report Marine Life in Distress

Report a sick, injured, entangled, stranded, or dead animal to make sure professional responders and scientists know about it and can take appropriate action. Numerous organizations around the country are trained and ready to respond. Never approach or try to save an injured or entangled animal yourself—it can be dangerous to both the animal and you.

Learn who you should contact when you encounter a stranded or injured marine animal

Report a Violation

Report a Violation

Call the NOAA Fisheries Enforcement Hotline at (800) 853-1964 to report a federal marine resource violation. This hotline is available 24 hours a day, 7 days a week for anyone in the United States.

You may also contact your closest NOAA Office of Law Enforcement field office during regular business hours.

-

Featured News

Infographic showing illustrated seal and sea lion and describing the differences between the two animals, such as ears, body size, flippers, etc. At first glance, seals (true or “earless seals”) and sea lions look fairly similar. Taking a closer look, these are some of the general differences to tell these animals, such as on the harbor seal (left) and California sea lion (right) pictured above.
Feature Story

Is It a Seal or a Sea Lion?

Alaska
New England/Mid-Atlantic
Pacific Islands
West Coast
National
Spotted, gray harp seal on sandy shore moving towards the ocean water. "Seuss," a juvenile harp seal, was released on Blue Shutters Beach, Rhode Island, following successful rehabilitation at Mystic Aquarium. Credit: Mystic Aquarium
Feature Story

Recent Prescott Grants Supporting Seal and Sea Lion Conservation Partners

National
An animation showing several species of seals in their native habitats with the words "Seal & Sea Lion Week" across the top. Seal & Sea Lion Week is March 11-15, 2024.
Feature Story

Seal and Sea Lion Week

Alaska
New England/Mid-Atlantic
Pacific Islands
Southeast
West Coast
National
Pair of bottlenose dolphins Pair of bottlenose dolphins. Credit: NOAA Pacific Islands Fisheries Science Center/Lisa Morse.
Podcast

50 Years of Protecting Marine Mammals

National
View More News

Management Overview

The harp seal is protected throughout its range under the Marine Mammal Protection Act.

Image
Close-up photo of juvenile harp seal looking at camera while resting on sand.
Juvenile harp seal. Credit: CC BY 2.0, Virginia State Parks staff

Conservation Efforts

NOAA Fisheries is committed to the protection of harp seals. Targeted management actions taken to secure protections for these seals include:

Reducing Vessel Interactions

Vessels can injure, kill, or disturb harp seals. The most effective way to reduce vessel disturbance is for vessels to stay away to keep seals and vessels apart. In New England, we have issued “Share the Shore” seal watching guidelines to reduce the disturbance of harp seals.

Learn more about “Share the Shore” guidelines

Implementing Oil Spill Response Plans in the Event of a Spill

Harp seals are at risk of harm in the event of an oil spill. To minimize the effect of a potential spill on harp seals, NOAA developed the Marine Mammal Oil Spill Response Guidelines. 

Learn more about pinniped and cetacean oil spill response guidelines

Overseeing Marine Mammal Health and Stranding Response

We work with volunteer networks in all coastal states to respond to marine mammal strandings including all pinnipeds. When stranded animals are found alive, NOAA Fisheries and our partners assess the animal’s health and determine the best course of action. 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 attribute strandings to disease, harmful algal blooms, vessel strikes, fishing gear entanglements, 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.

Learn more about the Marine Mammal Health and Stranding Response Program

Marine Mammal Unusual Mortality Events

Harp Seals have been part of a declared unusual mortality event in the past. Under the Marine Mammal Protection Act, an unusual mortality event  is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." To understand the health of marine mammal populations, scientists study unusual mortality events.

Get information on active and past UMEs

Get an overview of marine mammal UME

Educating the Public

NOAA Fisheries aims to increase public awareness and support for harp seal conservation through education, outreach, and public participation. We share information with the public about the status of harp seals, as well as our research and efforts to promote their recovery.


Regulatory History

All marine mammals, including harp seals, are protected in the United States under the MMPA.

Key Actions and Documents

Incidental Take

Incidental Take Authorization: Lamont-Doherty Earth Observatory's Marine Geophysical Survey of the Reykjanes Ridge in the North Atlantic Ocean

Incidental Take Authorization: Lamont-Doherty Earth Observatory's Marine Geophysical Survey of the Reykjanes Ridge in the North Atlantic Ocean
  • Notice of Final IHA
  • Notice of Proposed IHA
Notice,
International
Effective
06/27/2024

Incidental Take Authorization: United States Navy's Construction at U.S. Naval Submarine Base New London in Groton, Connecticut

Incidental Take Authorization: United States Navy's Construction at U.S. Naval Submarine Base New London in Groton, Connecticut
  • Notice of Reissued IHA
  • Notice of Final IHA
  • Notice of Proposed IHA
Notice,
New England/Mid-Atlantic
Effective
02/01/2026

Incidental Take Authorization: Transcontinental Gas Pipe Line Company LLC's construction with the LNYBL Natural Gas Pipeline Maintenance in Sandy Hook

Incidental Take Authorization: Transcontinental Gas Pipe Line Company LLC's construction with the LNYBL Natural Gas Pipeline Maintenance in Sandy Hook Channel, New Jersey
  • Notice of Final IHA
  • Notice of Proposed IHA
Notice,
New England/Mid-Atlantic
Effective
06/15/2024

Incidental Take Authorization: NOAA Office of Marine and Aviation Operations Research Vessel Relocation at Naval Station Newport in Rhode Island

Incidental Take Authorization: NOAA Office of Marine and Aviation Operations Research Vessel Relocation at Naval Station Newport in Rhode Island
  • Notice of Final Renewal IHA
  • Notice of Proposed Renewal IHA
  • Notice of Final IHA
  • Notice of Proposed IHA
Notice,
New England/Mid-Atlantic
Effective
02/27/2025
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More Information

  • Marine Mammal Permits and Authorizations
  • Marine Life Viewing Guidelines
  • Report a Stranding or Injured Marine Mammal

Last updated by NOAA Fisheries on 04/10/2025

Science Overview

NOAA Fisheries conducts various research activities on the biology, behavior, and ecology of harp seals. The results of this research are used to inform management decisions for this species. 

Stock Assessments

Determining the size of harp seal populations helps resource managers determine the success of conservation measures. Our scientists collect population information and present the data in annual stock assessment reports. 

Monitoring Population Abundance and Distribution

Scientists observe harp seals to record their numbers and distribution. By comparing numbers collected over multiple years, scientists can look for trends—i.e., whether the population is increasing, decreasing, or remaining stable during a given period.

More Information

  • Population Assessments
  • Scientific Research Permitting

Last updated by NOAA Fisheries on 04/10/2025

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