舟山褐牙鲆(<i>Paralichthys olivaceus</i>)仔鱼摄食和生长的研究

舟山褐牙鲆(Paralichthys olivaceus)仔鱼摄食和生长的研究

摘要: 试验研究了褐牙鲆Paralichthys olivaceus仔鱼的摄食和生长。结果表明，仔鱼初次开口摄食时间在6日龄(16~18℃)，初次摄食率为30%，8日龄饥饿仔鱼最大初次摄食率为65%，孵出后第9天达到不可逆点(PNR)，混合营养期为3 d左右。初次摄食强度和初次摄食率开始时较低，在卵黄囊耗尽时达最高，然后下降。随着饥饿时间的延长，仔鱼出现“负增长”，孵化第11天存活率仅为10%，12日龄全部死亡。

Abstract: The experiment was conducted to study feeding and growth of Paralichthys olivaceus larvae.Results showed that larvae began to fed at the age of six days at 16~18℃, and the feeding rate was 30%.The highest feeding rate was 65% at the age of 8 days.P.olivaceus larvae arrived the point-of-no-return (PNR) at the 9th day.The period of mixed nutrition of the larvae was 3 days.The initial feeding intensity and the feeding rate were slowly increased to the peak when the yolk sac almost exhausted and decreased after that.With the starvation prolonged, unfed larvae entered a negative growth.The survival rate was 10% at the 11th day after hatching.