Long-term changes in body size of Japanese flying squid <i>Todarodes pacificus</i> caught in the offshore area of the Sea of Japan

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  • 日本海沖合で漁獲されたスルメイカの体サイズの長期変化

Abstract

<p>　A squid jigging survey was conducted by the research vessel Hakusan-maru in the offshore area of the Sea of Japan from May to October from 1978 to 2019, and annual and seasonal changes in mantle length of Japanese flying squid Todarodes pacificus caught were investigated. The mean mantle length of the squid caught from August to October declined markedly from the 2000s to the 2010s. Seasonal changes in the mean mantle length were able to be divided into the growth period and then the stagnation period after reaching the adult mantle length. The growth rate of mantle length during the growth period decreased from the early 2000s to the late 2010s. The beginning of the stagnation period was delayed by at least two months from the late 1980s to the late 2010s. Therefore, the marked reduction of the mantle length since the 2000s was due to the decrease in growth rate and the delay in reaching the adult mantle length. These phenomena were considered to be related to the delay of spawning period of the squid with increasing water temperature at their spawning area.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 88 (4), 256-263, 2022-07-15

    The Japanese Society of Fisheries Science

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