長野県浦野川におけるブルーギル幼魚の胃内容物

DOI 日本農学文献記事索引 Web Site 被引用文献6件 参考文献15件

書誌事項

タイトル別名
  • Stomach Contents of Young Bluegill Lepomis macrochirus in the Urano River of Nagano Prefecture
  • ナガノケン ウラノガワ ニ オケル ブルーギル ヨウギョ ノ イ ナイヨウブツ

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抄録

Seventy-five young bluegill Lepomis macrochirus were captured by electro-fishing in the Aa-Bb river-type section of the Urano River in June and July, 2003. All bluegill were within 1 m of the river bank. Only 8 of the 75 bluegill did not have food present in the stomach. The index of stomach fullness was 0.63%±0.69 SD, reaching the maximum of 2.86%. Bluegill predominantly preyed on chironomid larvae (>60%), followed by ephemeropteran nymphs, trichopteran larvae and terrestrial insects. The diet of bluegill overlapped considerably with that of some other native fishes in the Urano River. Bluegill is considered to have a negative effect on the fish community in rivers and streams and needs to be eradicated.

収録刊行物

  • 水産増殖

    水産増殖 53 (2), 115-119, 2005

    日本水産増殖学会

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