通过光梯度方法 ,探讨了鳜鱼苗对红、黄、绿、蓝、白 5种光色的选择性及在不同光梯度下的趋光反应行为。结果表明 :鳜鱼苗对 5种颜色光表现出不同程度的趋光性和选择性 ,对黄色光和白光的趋光反应最强 ,趋光率分别为 89 75 %和 81 82 % ,最大可达到 93 75 %和 90 91% ,相应的适宜光源照度分别为 2 0 0 0～3 0 0 0lx和 15 0 0lx。 The optical gradient method was used to investigate the selectivities of five light colors of red, yellow, green, blue and white and the phototactic responses under different light gradients. The results showed that the fry had different phototaxis and selectivity to five kinds of light, the phototropism to yellow light and white light was the strongest, the phototactic rates were 89 75% and 81 82% respectively, and the maximum was 93 75 % And 90 91%, respectively, corresponding to the appropriate illuminance of light source 20000 ~ 30000lx and 1500lx.