Estimation of abundance for the migrating juvenile pink salmon in the rivers of Sakhalin and Iturup Islands in 2024
https://doi.org/10.26428/1606-9919-2025-205-284-297
EDN: ATZEXC
Abstract
Pink salmon is the leading object of salmon fishery in the Sakhalin-Kuril region. To forecast the status of its stocks, the number of juveniles migrated downstream was counted in the rivers Dagi, Malaya Khuzi, Pugachevka, Voznesenka, Ochepukha, Taranai, Kura and Kholodny Creek (tributary of the Poronai River) on the eastern coast of Sakhalin Island and in the Rybatskaya and Olya rivers on Iturup Island. These estimates reflected the year-class survival in the period from hatching to the juveniles release into marine waters. For each of these control rivers, the downstream migration index was calculated as the ratio of the number of spawners entered to the river to the number of their progeny migrated downstream.
Based on the data on total number of pink salmon spawners and the downstream migration index for the control rivers, the number of wild juveniles migrated to the sea from all rivers was calculated, separately by areas of the local stocks. The total number of pink salmon fry migrated to the sea from the spawning grounds on the east coast of Sakhalin and Iturup Island was estimated in 2024 as 1044.5 ∙ 106 ind. and 16.1 ∙ 106 ind., respectively. In addition to these numbers of wild fry, 101.8 ∙ 106 ind. were released from salmon hatcheries of eastern Sakhalin and 28.1∙106 ind. from salmon hatcheries of Iturup Island.
About the Authors
A. M. Kaev
Sakhalin branch of VNIRO (SakhNIRO)
Russian Federation
Russian Federation
Alexander M. Kaev, D.Biol., principal researcher
196, Komsomolskaya Str., Yuzhno-Sakhalinsk, 693023
P. S. Sukhonos
Sakhalin branch of Glavrybvod (Sakhrybvod)
Russian Federation
Russian Federation
Pavel S. Sukhonos, deputy head
43a, Emelyanov Str., Yuzhno-Sakhalinsk, 693006
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For citations:
Kaev A.M., Sukhonos P.S. Estimation of abundance for the migrating juvenile pink salmon in the rivers of Sakhalin and Iturup Islands in 2024. Izvestiya TINRO. 2025;205(2):284-297. (In Russ.) https://doi.org/10.26428/1606-9919-2025-205-284-297. EDN: ATZEXC
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