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The Egg Mortality in Walleye Pollock (Gadus chalcogrammus Pallas, 1814) during Embryogenesis in Waters off the Western Kamchatka Coast

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Abstract

Five consecutive ichthyoplankton surveys were conducted during the spawning season of the walleye pollock Gadus chalcogrammus, in April and May 2019, at a spawning ground off the western coast of the Kamchatka Peninsula. Daily walleye pollock egg production was estimated for each survey based on the number of spawned eggs recorded. The total egg production and mortality rate during embryogenesis were calculated for the spawning season. The highest mortality rates were observed at egg stages I and III. The total mortality was 86.8% of the number of spawned eggs. The new results we obtained allow substantial improvement of quality of abundance estimates for the walleye pollock spawning stock in the Sea of Okhotsk.

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ACKNOWLEDGMENTS

The authors are grateful to I.A. Naberezhnykh and A.Yu. Sheibak for their assistance in the laboratory-based processing of ichthyoplankton samples and rapid calculations of the number of pollock eggs spawned within the standard areas.

Funding

This study was carried out within the framework of the Concept for the Development of the Russian Federation’s Fisheries until 2020 (approved by the Directive of the Government of the Russian Federation of September 2, 2003, no. 1265-r) in accordance with the thematic plan of research works of the Pacific Research Fisheries Center for 2019.

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  1. Pacific Branch, Russian Federal Research Institute of Fisheries and Oceanography (TINRO), 690091, Vladivostok, Russia

    A. V. Buslov & A. V. Smirnov

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  1. A. V. Buslov
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  2. A. V. Smirnov
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Correspondence to A. V. Buslov.

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Conflict of interests. The authors declare that they have no conflict of interest.

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Translated by E. Shvetsov

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Buslov, A.V., Smirnov, A.V. The Egg Mortality in Walleye Pollock (Gadus chalcogrammus Pallas, 1814) during Embryogenesis in Waters off the Western Kamchatka Coast. Russ J Mar Biol 47, 249–255 (2021). https://doi.org/10.1134/S1063074021040040

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