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Spawning of walleye pollock (Theragra chalcogramma) off the Southwestern coast of Kamchatka

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Abstract

The results of ichthyoplankton surveys conducted in 2007–2008 showed that waters off Southwest Kamchatka and North Kuril Islands were areas of mass spawning of walleye pollock. The peak spawning occurred during the last 10 days of April and in early May, which was much later than the peak at the main spawning site off West Kamchatka. The spawning activity of walleye pollock near the southwestern shores of Kamchatka is a regular event, as the analysis of archive materials shows. This gave us grounds to suspect the existence of a southern site that coincided well with the mass spawning in the Shelikhov Gulf in its timing and scale, but was missed during standard ichthyoplankton surveys conducted in early April. After analyzing the growth rates of spawners, the assumption was made that the southern spawning was performed by the East Kamchatkan walleye pollock population, whose mass spawning usually occurs in late April-early May. According to the data of 2008, the estimated biomass of walleye pollock spawning in the area of the Ozernovskaya basin in late April was nearly 600000 tons. Regular monitoring of the southern spawning is proposed by means of additional ichthyoplankton surveys south of 53° N, including the Okhotsk Sea waters of the North Kuril Islands, in late April—early May.

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Authors and Affiliations

  1. Kamchatka Research Institute of Fisheries and Oceanography, Petropavlovsk-Kamchatsky, 683000, Russia

    A. V. Buslov

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  1. A. V. Buslov
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Correspondence to A. V. Buslov.

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Original Russian Text © A.V. Buslov, 2009, published in Izvestiya TINRO.

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Buslov, A.V. Spawning of walleye pollock (Theragra chalcogramma) off the Southwestern coast of Kamchatka. Russ J Mar Biol 35, 549–557 (2009). https://doi.org/10.1134/S1063074009070049

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  • DOI: https://doi.org/10.1134/S1063074009070049

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