温度对黄盖鲽仔鱼生长、发育、摄食及PNR的影响

EFFECTS OF WATER TEMPERATURE ON THE GROWTH, DEVELOPMENT,FEEDING AND PNR OF LARVAL MARBLED (LIMANDA YOKOHAMAE)

对黄盖鲽（Ｌｉｍａｎｄａｙｏｋｏｈａｍａｅ）仔鱼生长、发育、摄食及ＰＮＲ的研究结果表明：在１０．５－１９℃范围内，温度对其卵黄囊期仔鱼的生长基本上无影响，不适当地升高温度对卵黄耗尽至变态期之间仔鱼的生长不利，较高的温度可促进仔鱼的发育使之提早进入变态期，１０日龄内过高的升温可明显增加仔鱼的死亡率与畸形个体数。黄盖鲽仔鱼在２０日龄以内的摄食无明显节律性；温度对近变态期以前仔鱼在１０：００－１４：００之间的摄食强度基本上无影响，仔鱼的摄食强度随日龄的增加而逐步增加；适宜的轮虫投喂密度在１０日龄内为１０个／ｍｌ，１５－２０日龄为２０个／ｍｌ。黄盖鲽仔鱼的混合营养期很短，约在２４小时以内；仔鱼开口摄食期为孵化后４－６日；升温可使饥饿仔鱼提早进入ＰＮＲ。

This paper deals with the effects of different warer temperature on growth, development, feeding, PNR of larval Limanda yokohamae. The results are as follows:The water temperature ranging from 10.5 to 19℃ has no influence on growth of yolk-sac larvae of Limanda yokohamae. The rational high water temperature can accelerate the development of larvae, this made the larvae enter transformation phase earlier. The irrational high water temperature has unfavorable effect on larval development between yolk exhaustion phase and transformation phase. The mortality and the number of abnormal larvae increased because of the irrational high water temperature in the first ten days. The feeding of larvae in the first twenty days shows no obvious rhythm. The feeding intensity was not affected by water temperature from 10:00 to 14:00 before transformation phase. The feeding intensities of larvae increased with the development procedure. The suitable density of the Brachionus plicatilare was 5-10/ml in the first 10 days and 20/ml in the 10-20 days. The larvae have only 24 hours in mixing feeding phase. The larva was found to feed on the fourth day and the highest feeding rate was on the sixth day. The more higher temperature can make larvae reach PNR in advance.