光照对黄盖鲽仔鱼生长、发育及摄食的影响

EFFECTS OF LIGHT ON GROWTH, DEVELOPMENT AND FEEDING OF LARVAL LIMANDA YOKOHAMAE

光照对黄盖鲽仔鱼的生长、发育及摄食有显著影响，各组仔鱼的体长与体高在２０日龄时均产生了极显著的差异；Ｄｕｎｃａｎ多范围检验表明：４０～６０ｌｘ光照度下仔鱼生长最好；在４０～７０００ｌｘ范围内随光照度的增强，生长则变差，存活率下降，畸形个体增加。黑暗条件下及３～６ｌｘ条件下的仔鱼在１２日龄时全部因饥饿而死亡。在卵黄囊期的各组仔鱼不受外界环境影响，生长情况近似。４０～７０００ｌｘ光照度之间的５组在４日龄至２０日龄之间体长与日龄表现为直线关系，体高与日龄表现为指数函数关系。仔鱼的摄食强度（１０：００～１４：００）在４０～７０００ｌｘ范围内随光照度增强而减弱。１８：００～２２：００时区之间如给以适当光照，则仔鱼亦会有相当的摄食强度。

This paper deals with the effects of different light intensity on the growth, development and feeding of larval Limanda yokohamae . The results are as follows:Light has important influence on the growth, development and feeding of larval Limanda yokohamae . The body length and height of every group of larvae on the twenieth day all shows fair evident difference. Duncan New Multiple Range Test shows: Under the light intensity ranging from 40 to 60 lx, the growth and development of larvae are the best. Within the light intensity of 40 to 7000 lx, the stronger the light intensity is, the worse the growth is, the lower the survival rate is, the more the abnormal larvae are. The larvae under complete darkness and under the light intensity of 3 to 6 lx are all dead on the 12th day because of starvation. In the yolksac stage, the growth of every group of larvae is not influenced by the external environment and is similar to all. From the 4th to 20th day, the growth of body length of 5 groups of larvae under 40 to 7000 lx show straight line relation to age, and the growth of body height shows exponential function relation to age. From 40 lx to 7000 lx, the feeding intensity(10:00-14:00) of larvae is discreased with the increase of light intensity. If the appropriate light intensity is given between 18:00 and 22:00 , the larvae can also have fair feeding intensity. The suitable light intensity for larvae before the 20th day is 40-600 lx.