Abstract
Based on the data of the analysis of distribution of juvenile chum salmon Oncorhynchus keta that were marked at salmon hatcheries in the southern part of the Sakhalin Island and Japan it has been established that their stocks in the Sea of Okhotsk coastal waters off South Sakhalin and Japan are of mixed origin. One part of the stock is composed of juveniles from hatcheries located in the southern part of Sakhalin, and the other part is composed of migrants from the waters adjacent to Japan. The first part is formed by juveniles both from hatcheries on the Sea of Okhotsk and Sea of Japan coasts of South Sakhalin. The second part is formed by juveniles reared at hatcheries in all regions of Japan: the Pacific and Sea of Okhotsk coasts of Honshu and Hokkaido, and from the Sea of Okhotsk coast of Hokkaido and Izmena (Nemuro) Strait. In July, in the Sea of Okhotsk coastal waters off South Sakhalin, the length and weight of most juvenile chum salmon of Japanese origin exceed 10 cm and 10 g, and juveniles of Sakhalin origin are always smaller than 10 cm and 10 g, which makes it possible to differentiate juveniles in trawl catches.
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Original Russian Text © A.O. Shubin, E.G. Akinicheva, 2016, published in Voprosy Ikhtiologii, 2016, Vol. 56, No. 5, pp. 562–570.
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Shubin, A.O., Akinicheva, E.G. Origin of juvenile chum salmon Oncorhynchus keta (Salmonidae) in the Sea of Okhotsk coastal waters off South Sakhalin. J. Ichthyol. 56, 728–737 (2016). https://doi.org/10.1134/S0032945216050131
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DOI: https://doi.org/10.1134/S0032945216050131


