雑魚川源流域におけるニジマスとイワナの生態的特徴 Ecological aspects of rainbow trout and white-spotted char in a headwater tributary of Zako stream, central Japan

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抄録

Diet, growth and sexual maturity of introduced rainbow trout (Oncorhynchus mykiss) were studied in a headwater tributary of Zako stream, central Japan, where white-spotted char (Salvelinus leucomaenis) were indigenous. Sexually matured rainbow trout (22-26 cm TL and age 3 + ) were caught in mid-April. They fed primary on aquatic invertebrates, but fries of native char were also detected in the trout diet. Our results suggest that introduced rainbow trout may be crucial competitor and predator suppressing native char populations.

Diet, growth and sexual maturity of introduced rainbow trout (Oncorhynchus mykiss) were studied in a headwater tributary of Zako stream, central Japan, where white-spotted char (Salvelinus leucomaenis) were indigenous. Sexually matured rainbow trout (22-26 cm TL and age 3+) were caught in mid-April. They fed primary on aquatic invertebrates, but fries of native char were also detected in the trout diet. Our results suggest that introduced rainbow trout may be crucial competitor and predator suppressing native char populations.

収録刊行物

  • 信州大学教育学部附属志賀自然教育研究施設研究業績

    信州大学教育学部附属志賀自然教育研究施設研究業績 40, 9-13, 2003-03-25

    信州大学

各種コード

  • NII論文ID(NAID)
    110004677873
  • NII書誌ID(NCID)
    AA11520449
  • 本文言語コード
    JPN
  • 資料種別
    Departmental Bulletin Paper
  • 雑誌種別
    大学紀要
  • ISSN
    03899128
  • NDL 記事登録ID
    6519731
  • NDL 雑誌分類
    ZR3(科学技術--生物学--植物) // ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z18-60
  • データ提供元
    NDL  NII-ELS  IR 
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