キタオッ卜セイ:国際的な保護から現状把握へ

摘要

Northern fur seal (Callorhinus ursinus) is distributed along the north Pacific Ocean, the Bering Sea and the Sea of Okhotsk. They were over-harvested for the fur trade of the 18th and 19th centuries and the North Pacific Fur Seal Treaty was signed by the United States, Russia, Japan and the United Kingdom on behalf of Canada in 1911. Recently, competition between fisheries and seals has been reported along the Japan Sea coast of Hokkaido. To understand their ecology and current status, various studies have been carried since 2008.