鮸状黄姑鱼人工繁殖与育苗技术的研究

Studies on the Technique of the Artificial Propagation and Larva Nursery of Nibea miichthioides

鮸状黄姑鱼人工繁殖与育苗技术的研究表明：在网箱内培育３龄以上的亲鱼经激素诱导后可在网箱内自然产卵；催产激素ＬＨＲＨ－Ａ和ＨＣＧ，催产率达到１００％；效应时间在３６～４０ｈ之内；受精卵在水泥池充气孵化，平均孵化率为８５．７％。在水泥池培育仔鱼的平均成活率为５２％～７５％，培育稚鱼的成活率为３５％～４５％，培育幼鱼的成活率为１１％；使用土池培育早期仔鱼，１５ｄ仔鱼，２２ｄ稚鱼和２７ｄ稚鱼的成活率分别为８％，１９％，３０％和４５％。在盐度３０、水温２４．２℃的条件下，从受精卵到孵化出苗需要２３ｈ３０ｍｉｎ，在试验期间海水盐度为２０～３４，水温１８～２８℃，ＤＯ６．５ｍｇ／Ｌ以上，ｐＨ值为８～８．５。

The results of the researches on the technique of the artiticial propagation and larva nurseryof Nibea miichthioides Chu. Lo & Wu indicated: the 3-year old Nibea miichthiolides cultured in thecages could spawn naturally in the cages aller the hormone induction; the induction rate was 100 %with the hormones of LHRH-A and HCG; the effective time was 36~40 h; the average hatching ratewas 85 % when the fertilized eggs were hatched in the concrete ponds. In the concrete ponds, theaverage survival rates of larvae .fry .and juveniles were 52%~75%.35%~45 % and 11 %.respcctively; in the earth ponds, the average survival rates of hatchings. 15 d old larvae. 22 d oldlarvae. and 27 d old larvae were 8%. 19%,30 %,and 45 %. respectively. The hatching time was about23 h and 30 min with a salinity of 30 and a mean water temperature of 24. 2℃. During theexperimntal period. the salinity was 20~34. the water temperature was 18 ~ 28℃. the dissolvedoxygen was > 6.5mg.L-1. and the PH was 8.00~8.15.