鲢、草鱼幼鱼对不同形状网目反应的研究

Comparative Study on the Response of Juvenile Silver Carp,Grass Carp to Meshes of Different Shapes

研究鲢、草鱼幼鱼对三种不同形状网目定置网片的反应，并探讨草鱼幼鱼反应节律性。结果表明：定置网片对两种幼鱼均有一定的诱集作用，其作用大小与网目形状有关．不同形状网目对鱼的视觉诱引力相同，而扁形网目对鱼的触觉诱引力大于长形、方形网目．穿网能力的顺序：方形＞长形＞扁形可用穿网系数Ｋ来定量表述．草鱼幼鱼趋网、碰网和穿网尾次数具明显昼夜节律性．

The response of juvenile of silver carp and grass carp to 3 kinds ofmeshes of different shapes and the responsive rhythm of juvenile of grass carp are studied.Results show:all set nets have certain attraction effect on the two young fish.The degree ofeffect is reiated to mesh shape. Meshes of different shapes have the same visual attraction forfish,but flat meshes have greater tactile attraction than rectangle and square meshes. Here isthe order of the ability of passing through:square>rectangle>flat.We can quantify it by thecoeffiicient of passing through The number of net taxis,touch net and passing through has obvious circadian rhythm.