富栄養湖のヨシ帯における餌料環境の季節変化に応じたチャネルキャットフィッシュの餌利用シフト

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タイトル別名
  • Dietary shift of channel catfish in response to seasonal changes in prey availability at a reed belt in a eutrophic lake, central Honshu, Japan
  • フ エイヨウコ ノ ヨシタイ ニ オケル ジリョウ カンキョウ ノ キセツ ヘンカ ニ オウジタ チャネルキャットフィッシュ ノ エサ リヨウ シフト

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To ascertain seasonal changes in food habits of the introduced catfish Ictalurus punctatus and prey availability, the stomach contents of 218 specimens (13.1-60.5 cm in standard length) collected in a reed area in Lake Kitaura, Japan, from May to August 2015, were examined. Stomach fullness index in immature and adult fish did not differ significantly between May-June and July-August. Ranking index of major food items (terrestrial plants, fragments of large fishes, chironomid larvae, Macrobrachium nipponense and Tridentiger brevispinis) in immature and adult fish largely changed from May-June to July-August, such changes being partly consistent to seasonal dynamics in prey abundance.

収録刊行物

  • 水産増殖

    水産増殖 66 (2), 141-145, 2018

    日本水産増殖学会

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