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Distribution and Size and Sex Composition of the Mud Skate Bathyraja taranetzi in the Pacific Waters off the Northern Kuril Islands and Coasts of Southeastern Kamchatka in the Summer Period

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Abstract

In the summer period, the mud skate Bathyraja taranetzi lives at depths from ~100 to 757 m in the Pacific waters off the northern Kuril Islands and southeastern Kamchatka; it concentrates off the northern Kuril Islands in the depth range of 250−360 m. Specimens of 11.3−67.5 cm in length (TL) were recorded in catches. Only large fish occur at a depth of <200 m; they are constantly recorded in catches to a 450-m isobath. At the initial stages of development, mud skate concentrates in the range from 301 to 450 m. The average fish length tends to decrease to a depth of 300 m, then the size composition is similar and the fish length increases deeper than 450 m according to the data of solitary findings. Adult specimens inhabit the outer shelf and upper slope at the temperature of 1.8−3.9°С, fish, TL < 37 cm prefer the temperature of 3.7°С and above. The sex ratio is similar among immature specimens. Males prevail in the size group of 52−58 cm TL that is due to their early maturation compared to females. Females begin to dominate among fish TL > 60 cm because they attain larger sizes than males In general, the sex ratio in the population of mud skate is close to 1 : 1.

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Authors and Affiliations

  1. National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia

    V. V. Panchenko & A. A. Balanov

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

    A. B. Savin

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  1. V. V. Panchenko
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  2. A. A. Balanov
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Correspondence to V. V. Panchenko.

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Translated by N. Ruban

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Panchenko, V.V., Balanov, A.A. & Savin, A.B. Distribution and Size and Sex Composition of the Mud Skate Bathyraja taranetzi in the Pacific Waters off the Northern Kuril Islands and Coasts of Southeastern Kamchatka in the Summer Period. J. Ichthyol. 60, 585–592 (2020). https://doi.org/10.1134/S0032945220040141

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