Chum salmon Oncorhynchus keta (Walbaum) on the continental coast of the Okhotsk Sea. Communication 2. The juveniles
https://doi.org/10.26428/1606-9919-2022-202-774-792
Abstract
Long-term data on downstream migration, qualitative and quantitative characteristics and feeding of juvenile chum salmon are generalized for the continental coast of the Okhotsk Sea. The downstream migration begins in conditions of certain heating of river waters; its dynamics depends on the rate of water flow and other environmental factors. The juveniles migrate from rivers to the coastal waters both in the daytime and at night. Their qualitative characteristics change in correspondence with escapement of either summer or autumn races of chum salmon progeny from the spawning grounds. The juveniles stay in the coastal waters until September. Their food spectrum is determined by the inhabited biotope.
Keywords
chum salmon,
Oncorhynchus keta,
downstream migration,
biological characteristics,
intraspecific structure,
Okhotsk Sea
Supporting agencies: The author is sincerely thankful to the staff of Magadan and Khabarovsk branches of VNIRO, Okhotsk branch of Glavrybvod, Okhotsk Territorial Administration of the Federal Fishery Agency, Institute of Biological Problems of the North, and Far-Eastern Branch of the Russian Academy of Sciences for collection of the data on chum salmon juveniles on the continental coast of the Okhotsk Sea and the data submission for this study. The author appreciates valuable advices and remarks for the article from S.E. Kulbachny (KhabarovskNIRO) and E.A. Kirillova (KamchatNIRO, IPEE RAS).
About the Author
S. L. Marchenko
Russian Federal Research Institute of Fisheries and Oceanography
Russian Federation
Russian Federation
Sergey L. Marchenko - Ph.D., adviser
105187, Moscow, Okruzhnoj proezd, 19
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Review
For citations:
Marchenko S.L. Chum salmon Oncorhynchus keta (Walbaum) on the continental coast of the Okhotsk Sea. Communication 2. The juveniles. Izvestiya TINRO. 2022;202(4):774-792. (In Russ.) https://doi.org/10.26428/1606-9919-2022-202-774-792
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