Migratory ecology of skipjack tuna <i>Katsuwonus pelamis</i> caught off Kyushu Island, Japan —a potential size screening effect of the Kuroshio

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  • YAMASHITA HIDEYUKI
    Marine Fisheries Research and Development Center (JAMARC), Japan Fisheries Research and Education Agency
  • YANAGIMOTO TAKASHI
    National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency
  • SAKUMA KAY
    Japan Sea National Fisheries Research Institute, Japan Fisheries Research and Education Agency
  • KIMURA TAKUTO
    Marine Fisheries Research and Development Center (JAMARC), Japan Fisheries Research and Education Agency
  • KUROSAKA KOHEI
    Marine Fisheries Research and Development Center (JAMARC), Japan Fisheries Research and Education Agency
  • OGURA MIKI
    Marine Fisheries Research and Development Center (JAMARC), Japan Fisheries Research and Education Agency

Bibliographic Information

Other Title
  • 九州周辺海域で漁獲されるカツオの回遊生態—黒潮流域でのサイズスクリーニングの可能性—
  • 九州周辺海域で漁獲されるカツオの回遊生態 : 黒潮流域でのサイズスクリーニングの可能性
  • キュウシュウ シュウヘン カイイキ デ ギョカク サレル カツオ ノ カイユウ セイタイ : クロシオ リュウイキ デ ノ サイズスクリーニング ノ カノウセイ

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Abstract

<p>　Skipjack tuna Katsuwonus pelamis migrating off Kyushu Island are an important resource for the pole and line fisheries in Japan. Skipjack tuna caught in the area west of Kyushu and off Tokara Islands were compared based on fork length (FL), condition factor (CF) and genetic structure. The results indicate differences in FL and CF of the skipjack tuna between the two fishing regions. The FL compositions of skipjack tuna in the area west of Kyushu were composed of a group of around 50 cm FL in July and around 60 cm FL in October, unlike those from off Tokara Islands which were composed of multiple groups of 40-70 cm FL. In addition, the CF of the fishes caught in the area west of Kyushu tended to be significantly higher than those caught off Tokara Islands. However, no significant difference in mtDNA profiles was found between the skipjack tuna from west of Kyushu and from off Tokara Islands. It is suggested that a size screening effect occurs around the Kuroshio Current south of Kyushu, as occurs in the Tohoku region, i.e. only the individuals of approximately 50-60 cm FL migrate northward beyond the Kuroshio Current in early summer.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 84 (4), 630-640, 2018-07-15

    The Japanese Society of Fisheries Science

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