Steller sea lions range along the North Pacific Rim from northern Japan to California. Pupping and breeding occur late May to early July throughout their range. Males set up territories on rookeries in late May, females arrive shortly thereafter and give birth to a single pup. They alternate between nursing their pup and feeding trips; most pups are weaned by the end of their first year. The species is not known to migrate, but individuals disperse widely outside of the breeding season, particularly adult males and juveniles. Adult males are up to 3.25 m long and weigh up to 1120 kg; females are considerably smaller at up to 2.9 m and 350 kg. Pups weigh about 23 kg at birth. Two separate stocks of Steller sea lions are recognized within U. S. waters: an eastern and western stock. As a result of a precipitous decline in numbers beginning in the 1970s, the western stock is presently listed as Endangered under the ESA.
- Population Decline
- Steller sea lion research coordination, 2007, 2008, 2009, 2010, 2011
- Steller sea lion surveys 2008, 2009, 2010, 2011, 2012
- Steller sea lion databases
- Employing Technology for Conservation
- Telemetry Research
- Current Research Projects by the Alaska Ecosystems Program
- Current Research Projects by the California Current Ecosystems Program
- Publications: search AFSC database for Steller Sea Lions
- Posters: search AFSC database for Steller Sea Lions
- Quarterly Reports
- SINCLAIR, E. H., D. S. JOHNSON, T. K. ZEPPELIN, and T. S. GELATT.
2013. Decadal variation in the diet of Western Stock Steller sea lions (Eumetopias jubatus). U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-248, 67 p. (.pdf, 2.96 MB). Online.
- LANDER, M. E., L. W. FRITZ, D. S. JOHNSON, and M. G. LOGSDON.
2013. Population trends of Steller sea lions (Eumetopias jubatus) with respect to remote sensing measures of chlorophyll-a in critical habitat. Mar. Biol. 160:195-209.
- REA, L. D., J. M. CASTELLINI, L. CORREA, B. S. FADELY, and T. M. O'HARA.
2013. Maternal Steller sea lion diets elevate fetal mercury concentrations in an area of population decline. Sci. Total Environ. 454-455:277-282.
- ALTUKHOV, A. V., P. A. PERMYAKOV, R. D. ANDREWS, V. N. BURKANOV, D. G. CALKINS, A. M. TRUKHIN, and T. S. GELATT.
2012. Adult Steller sea lion mortality on rookeries in the Russian Far East, 2002-2010. Russ. J. Mar. Biol. 38:442-447.
- Search the AFSC database for additional Steller Sea Lion publications
- Seasonal Distribution and Relative Abundance of Steller Sea Lion Prey in the Aleutian Islands
2.07 MB Online.
- Steller Sea Lions (Eumetopias jubatus) Demographic Studies in Russian Waters
8.87 MB Online.
- Local Abundance and Movement of Atka Mackerel and Other Steller Sea Lion Prey in the Aleutian Islands
19 MB Online.
- Search the AFSC database for additional Steller Sea Lion posters