北部日本海中層に生息するスケトウダラの春季と秋季における食性 Food Habits of Walleye Pollock Inhabiting the Mesopelagic Zone in the Northern Japan Sea in Spring and Autumn

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The diet and feeding intensity of walleye pollock <i>Theragra chalcogramma</i> were investigated in April and October 1993, and in April 1994. Specimens ranging from 262 to 456mm in standard length were sampled with a mid-water trawl off Hiyama Subprefecture and Aomori Prefecture in the northern Japan Sea. The main food items were large-sized zooplankton. In April, pollock fed chiefly on euphausiids (<i>Thysanoessa longipes</i>), chaetognaths, and hyperiid amphipods (<i>Themisto japonica</i>). In October, the main food organisms were hyperiid amphipods (<i>T. japonica</i>). Stomach-content weight indices indicated that the feeding intensity of pollock was stronger in April (after spawning) than in October (before spawning). The numerical compositions of food categories in April differed among sampling stations. Such differences were not observed in October. It seems likely that the distinct variation of diets in April is ascribed to geographic differences in zooplankton composition in the mesopelagic zone.

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  • 日本水産学会誌  

    日本水産学会誌 63(4), 537-541, 1997-07-15 

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10004851403
  • NII書誌ID(NCID)
    AN00193422
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00215392
  • NDL 記事登録ID
    4258508
  • NDL 雑誌分類
    ZR26(科学技術--農林水産--水産)
  • NDL 請求記号
    Z18-345
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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