Multiparous Female Snow Crabs Chionoecetes opilio without or with Only a Small Brood, Caught in the Western Part of the Sea of Japan (Preliminary Observations)

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  • HARADA Kazuhiro
    Tajima Fisheries Technology Institute, Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • OHTANI Tetsuya
    Tajima Fisheries Technology Institute, Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries

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Other Title
  • 日本海西部海域で漁獲される抱卵数が少ない雌ズワイガニに関する調査（予報）
  • ニホンカイ セイブ カイイキ デ ギョカク サレル ホウランスウ ガ スクナイ メス ズワイガニ ニ カンスル チョウサ ヨホウ

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Abstract

Multiparous female snow crabs Chionoecetes opilio without or with only a small brood (termed as “Konashi” or “Heriko” in fish markets) caught in the western part of the Sea of Japan were investigated in November - December 2005. Among the 404, 595 female snow crabs caught by bottom trawl, the frequency of crabs without or a small brood was 1.3%. Of the “Konashi” or “Heriko” crabs, the frequency of crabs that had a few or many brown-colored scars and epibionts on the carapace was 64.3%, and the frequency of crabs without a brood was 33.0%. For the crabs without a brood, the number of sperm remaining in a seminal receptacle tended to be few. As for the crabs without a brood and had many brown-colored scars and epibionts on the carapace and legs (regarded as aged crabs), the ovary weight index was low. But the primary factor of occurrence of female crabs without or a small brood was not clarified in this study.

Journal

  • Aquaculture Science

    Aquaculture Science 54 (3), 399-405, 2006

    Japanese Society for Aquaculture Science

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