Winter-autumn fishery of walleye pollock <i>Gadus chalcogrammus</i> (Gadidae) by bottom gill nets in the Kunashir Strait in 1999

Winter-autumn fishery of walleye pollock <i>Gadus chalcogrammus</i> (Gadidae) by bottom gill nets in the Kunashir Strait in 1999–2022

Published:2023-12-13 Issue:69 Volume: Page:5-26
ISSN:2782-6236
Container-title:The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean
language:
Short-container-title:Issledovaniâ vodnyh biologičeskih resursov Kamčatki i Severo-Zapadnoj časti Tihogo okeana

Author:

Tok Kim Sen¹

Affiliation:

1. Sakhalin Branch of Russian Federal Research Institute of Fisheries and Oceanography (SakhNIRO)

Abstract

Japanese gill net fishery of walleye pollock in the Kunashir Strait, also well-known as local spawning grounds of this species, has been carried out in the eastern (Russian) part for more than 20 years. The results of the fishery allow us to consider general trends in the long-term changes of the local stock in mentioned dynamic and still underexamined area on the border of the Sea of Okhotsk and the Pacific Ocean. The use of a large series of standardized catch per effort as an index of stock biomass indicates specific dynamics of walleye pollock stock biomass in the Kunashir Strait, different from the behavior in the adjacent ocean waters of the southern Kuril Islands. On the background of a long-term trend of decreasing catch per effort in the Kunashir Strait, the CPUE in the ocean waters of the islands, as well as in the southern part of the Sea of Okhotsk, demonstrates opposite trend of increase of this parameter.

Publisher

Kamchatka Research Institute of Fisheries and Oceanography

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