the helpful comments and advice by officers in Hii-River Fishery Cooperatives and Dr.Kayoko Kameda of Lake Biwa Museum.The River Found No.27-1263-020 and No.28-5311-020;JSPS Research Grants No.15H06417 and No.16KT0018;WEC Research Grant No.2016-02,and The Kyoto University Foundation support this research.
Excessive predation pressure from the waterfowl Phalacrocorax carbo(Great Cormorant)on Plecoglossus altivelis(Ayu)has recently been a severe problem of river environment in Japan.Local fishery cooperatives are current...