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Spawning site conditions of endangered subspecies of Japanese sweetfish named Ryukyu-ayu inhabiting only in the Amami-Oshima Is., Southern Japan were evaluated with an in-situ measurement method of riverbed-scour potential to clarify substratum adhesion of riverbed. In the present method, man-made flow was occurred near river bed and the resultant scour depth was measured. The field survey using the present method was conducted in Yakugachigawa River in Amami-Oshima Is. The result shows that the present method was found to be more suitable for evaluating spawning site condition than a wellknown penetrometer. The results also indicate that appropriate parameters for evaluation of spawning site conditions are discussed using scour depth, grain size and flow condition.

EVALUATION FOR SPAWNING SITE OF RYUKYU-AYU USING AN IN-SITU MEASUREMENT METHOD OF RIVERBED-SCOUR POTENTIAL