Science & Data

Every year, biologists from the Alaska Fisheries Science Center Marine Mammal Laboratory survey the endangered Steller sea lion during the summer months in Alaska. This map provides a compilation of information collected during the 2016 field season, which included surveys via air, vessel and remote field camps.

This dataset contains site names with corresponding geographic coordinates of 472 consistently-used and known Steller sea lion haul sites.

This file contains counts from the Alaska Fisheries Science Center's Marine Mammal Laboratory database of Steller sea lion pups on rookeries in Alaska.

This database contains counts of adult and juvenile (non-pup) Steller sea lions on rookeries and haulouts in Alaska made between 1904 and 2015. Non-pup counts have been conducted throughout the year. Breeding season (June-mid July) non-pup counts are used for population trend analysis, while counts at other times are used for analyses of distribution and for other purposes. Non-pups are counted from the ground (by walking along the rookery), from cliff-side overlooks, and from aerial imagery (oblique and vertical orientation). Non-pup counts represent only a fraction of the total number of animals that may use a site. Sea lions haulout less frequently in winter than in summer; thus, winter counts represent a smaller fraction of the total population than summer counts.

This database contains counts of Steller sea lion pups on rookeries in Alaska made between 1961 and 2015. Pup counts are conducted in late June-July. Pups are counted from the ground (by walking along the rookery), from cliff-side overlooks, and from aerial images (oblique and vertical orientation). Pup counts conducted in late June-mid July are considered to represent a complete census of pups produced at each site during the year.

Aerial, ship, and land-based surveys to count Steller sea lion (Eumetopias jubatus) adults, juveniles, and pups on terrestrial rookery and haulout sites in Alaska were conducted by the Marine Mammal Laboratory (MML) in June to July 2015.

This file contains counts from the Alaska Fisheries Science Center's database of non-pup (adult and juvenile) Steller sea lions in Alaska.

Aerial and ship-based surveys to count Steller sea lion (Eumetopias jubatus) adults, juveniles, and pups on land in Alaska were conducted by the National Marine Mammal Laboratory (MML) in June to July 2014.

This database contains information on individual sea lions that were marked or handled from 1985-2018

The Marine Mammal Laboratory (MML) conducted aerial and ship-based surveys to count Steller sea lion (Eumetopias jubatus) adults, juveniles, and pups on land in Alaska in June to July 2013.