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It is important to secure the rest area for fish. Fish has the ordinary and dark muscle. When fish uses ordinary muscle, fish got tired. In such a situation, fish needs a rest. In this study, rest characteristic of Ayu (Plecglossus altivelis altivelis) with changing the width and the number of interception was researched. The migration rates of Ayu were obtained with the aid of a digital video camera. It was found that the swimming speed increased with an increase of flow velocity, because Ayu swims in keeping with flow velocity for preventing to be drift towards downstream. The total time of the rest increased with an increase of flow velocity.

doboku gakkai rombunshuu. g, kankyou

EFFECTS OF TRANSVERSE WIDTH PATTERN OF INTERCEPTION CONSTRUCTED IN OPEN-CHANNEL ON SWIMMING CHARACTERISTIC OF AYU, &lt;i&gt;PLECOGLOSSUS ALTIVELIS ALTIVELIS&lt;/i&gt;