Миграции тихоокеанской сайры в период нагула в районе Курильских островов и Охотского моря

• Main Author: Филатов, В.
• Format: Text
• Language: unknown
• Published: Федеральное государственное унитарное предприятие «Тихоокеанский научно-исследовательский рыбохозяйственный центр» 2004
• Subjects: Kuril Strait; Okhotsk; Oyashio; Pacific; okhotsk sea; Subarctic
• Online Access: http://cyberleninka.ru/article/n/migratsii-tihookeanskoy-sayry-v-period-nagula-v-rayone-kurilskih-ostrovov-i-ohotskogo-morya; http://cyberleninka.ru/article_covers/537165.png

Приведены результаты исследований, уточняющие и дополняющие схему миграций тихоокеанской сайры. Представленная схема, в отличие от существующих, отражает перемещение сайры из Тихого океана в Охотское море и обратно, а также перемещение той части популяции, которая оказывается вне районов основного ее воспроизводства. Исследования базируются на материалах траловых пелагических съемок, промысловых данных и данных визуальных наблюдений научно-поисковых и промысловых судов в период нагула тихоокеанской сайры с 1981 по 2003 г. The study is based on observations of saury shoals shifts during the period of its fishing in Russian EEZ in JulyOctober. In JulySeptember, the abundant saury shoals are observed in the northern Kuril straits, sometimes as far northward as Kruzenshtern Strait and the Second Kuril Strait (in 1987, 1988), migrating from the Pacific Ocean to the Okhotsk Sea. Later they widely distributed over the southern part of the Sea, probably mixing with the saury shoals originated from the Japan Sea. Since August, the saury shoals move from the Okhotsk Sea to the Pacific Ocean through the southern Kuril straits, in particular Ekaterina (Kunashiri) Strait and Friz (Etorofu) Strait. As a result, abundant fishing grounds are formed at the Pacific side of the southern Kuril Islands in late August, September, and early October. In SeptemberOctober, the saury shoals shift southwestward with the waters of the first branch of Oyashio. In the second half of October, the main part of saury distributes at the coast of Hokkaido, where Japanese fleet catches its dense accumulations. Furthermore a large part of them runs to the basic spawning grounds of Pacific saury in subtropical waters. Another part of saury population forms dense feeding accumulations off the central Kuril Islands (between 149155° E) in the period from October to December. These shoals migrate gradually to the southwest, south and southeast directions with the second and third branches of Oyashio. They almost have no ability to reach the basic spawning grounds because of a huge distance to them (> 600 n.miles). These fish continue the feeding in Oyashio waters and Subarctic zone until maturation of gonads that happens approximately in FebruaryApril, and spawn in the Subarctic waters or in the mixed waters of the Subarctic Front. Probably a large part of their progeny moves farther to the ocean and enlarge the population inhabiting the central Pacific. Another part can enter back to Oyashio waters and enlarge the feeding accumulations of saury in the Kuril Islands region. The presented scheme of Pacific saury migrations develops considerably the well-known Kosaka scheme of saury migrations (Kosaka, 1986).