EFFECTS OF BOULDERS INTERVAL IN STREAMWISE DIRECTION OVER OPEN CHANNEL BED ON SWIMMING BEHAVIOR OF <i>Opsariichthys platypus</i>

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  • 開水路底面に設置した粗石の流下方向間隔がオイカワの遊泳特性に及ぼす影響
  • カイスイロ テイメン ニ セッチ シタ ソセキ ノ リュウカ ホウコウ カンカク ガ オイカワ ノ ユウエイ トクセイ ニ オヨボス エイキョウ

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Abstract

 It is important to keep suitable area by boulders to make rest area for fish. In this study, swimming behavior of Opsariichthys platypus in open channel were compared with change of boulders interval in streamwise direction over open channel bed. Swimming behaviors of Opsariichthys platypus were obtained with the aid of two sets of digital video cameras. It was found that swimming of Opsariichthys platypus was stagnant remarkably in cases where the boulders interval in downstream direction was narrow. It is because that there are more low velocity spaces in this case compared with cases where the boulders interval in downstream direction is wide.

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