岩熊井堰中央魚道におけるアユ遡上について

DOI 日本農学文献記事索引 被引用文献9件 参考文献10件

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タイトル別名
  • Time of Upstream Migration of Ayu, Plecoglossus altivelis, in the Gokase River.

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抄録

The number of Ayu, plecoglossus altivelis going upstream through the central fishway of Iwakuma weir in the Gokase River, Miyazaki Prefecture, was investigated for 3 years. There were large differences in the numbers of fish moving upstream among the three years. However, the peak time of the upstreaming occurred at 14-18 o'clock during a period from the last ten days of April to the middle of May. Upstreaming was frequently observed when water temperature in the fishway was in the range of 15-20°C and the flow in the lower stream of the fishway was abundant. The numbers of upstreaming fish on fine days were larger than that on rainy days. Further, upstreaming fish were more numbers on the days near new moon than near full moon.

収録刊行物

  • 水産増殖

    水産増殖 44 (1), 1-6, 1996

    日本水産増殖学会

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