EFFECTS OF FLOW VELOCITY AND ACCELERATION IN INCREASING DISCHARGE ON SWIMMING BEHAVIOR OF <i>OPSARIICHTHYS PLATYPUS</i>

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  • 増水時における流速と加速度がオイカワの遊泳特性に及ぼす影響
  • ゾウスイジ ニ オケル リュウソク ト カソクド 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

 The state of the fish movement changes during the duration and it is shown that fish move to the low velocity zone or migrate upstream. The acceleration and the velocity are the factors that effect on the swimming behavior. The porpose of this study is to make clear that effects of the acceleration and the velocity during acceleration on the swimming behaviours of Opsariichthys platypus. The base velocity was fixed, the acceleration and latter velocity was changed. The swimming behavior in open channel was recorded with a digital video camera. As a result, it is found that downstrem migration rate of Opsariichthys platypus increased with the increase of acceleration during and after the increasing discharge. In addition, when the latter half of acceleration time compared with the first half, ground speed of Opsariichthys platypus looking toward upstream decreases.

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