Northern fur seals occur from southern California north to the Bering Sea and west to the Okhotsk Sea and Honshu Island, Japan. During the summer breeding season, most of the worldwide population is found on the Pribilof Islands in the southern Bering Sea, with the remaining animals on rookeries in Russia, on Bogoslof Island in the southern Bering Sea, and on San Miguel Island off southern California. At the rookeries, adult males set up territories in May, females arrive in June and give birth to one pup a few days later. Most pups are weaned at about 4 months in November. After the breeding season, adult males from the Pribilof Islands migrate to the Gulf of Alaska , while adult females and juveniles migrate through the Aleutian Islands into the North Pacific Ocean, often as far south as the Oregon and California offshore waters. Many pups may remain at sea nearly 2 years before returning to their rookery of birth. Pups weigh up to 5.4 kg at birth; adult males average 2.1 m in length and can weigh up to 275 kg. Adult females are much smaller; they weigh 30 to 50kg.
- Biology
- Distribution and breeding sites in U.S.
- Life history
- Estimating abundance
- Summer foraging trips
- Winter migration
- El Niño impacts
- Entanglement in marine debris
- Northern fur seal bibliography
- Northern fur seal Photo Archive
- 2008 NFS pup production and adult male counts on Pribilof Islands (updated 4/24/09)
- 2007 Pribilof Islands Adult Male Counts
- Current Research Projects by the California Current Ecosystems Program
- Current Research Projects by the Alaska Ecosystems Program
- Publications: search AFSC database for Northern Fur Seals
- Posters: search AFSC database for Northern Fur Seals
- Quarterly Reports
- Fur seal investigations: 2004-2005, 2002-2003, 2000-2001, 1999, 1998, 1997
- LEA, M-A., D. JOHNSON, R. REAM, J. STERLING, S. MELIN, and T. GELATT.
2009. Extreme weather events influence dispersal of naive northern fur seals. Biol. Lett. 5:252-257.
- YANO, K. M., J. Y. TINGG, and C. W. FOWLER.
2009. Northern fur seal rookery photo archive: Aerial and ground-level photos, Pribilof Islands, Alaska, 1895 - 2006. AFSC Processed Rep. 2009-03, 62 p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115. (.pdf, 4.3 MB). Online.
- INSLEY, S. J., B. W. ROBSON, T. YACK, R. R. REAM, and W. C. BURGESS.
2008. Acoustic determination of activity and flipper stroke rate in foraging northern fur seal females. Endang. Species Res. 4:147-155. (.pdf, 610KB). Online.
- TOWELL, R. G., R. R. REAM, J. R. THOMASON, K. A. CALL, T. K. ZEPPELIN, and R. CARUSO.
2008. Mass, length, and sex ratios of northern fur seal pups on the Pribilof Islands, 2006, p. 26-40. In J. W. Testa (editor), Fur Seal Investigations, 2006-2007. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-188.
- Search the AFSC database for additional Northern Fur Seal publications
- Modeling Marine Mammal Movement Data - A Hierarchical Model for Dynamic Movement of Northern Fur Seals
508KB Online.
- Killer Whale Predation on Northern Fur Seals - Is it Increasing?
2.85MB Online.
- Population Structure as Revealed by mtDNA and Microsatellites in Northern Fur Seals, Callorhinus ursinus
5.37MB Online.
- Search the AFSC database for additional Northern Fur Seal posters