Abstract
The northern fur seal, Callorhinus ursinus, breeds in summer and fall on the Pribilof Islands, Alaska; Bering, Copper, and Commander Islands, off Kamchatka, USSR; and Robben Island, off Sakhalin, USSR. In winter and spring, for about nine months, the species is widely dispersed over the North Pacific Ocean, as far south as 30° N. Latitude, up to 3,000 miles from its breeding grounds. The Alaskan stock reaches an annual peak of abundance of about 1,250,000 animals late in summer after the pups are born. The Asian stocks have been estimated at about 250,000 seals.
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