美洲鲥仔稚鱼淡、海水培育试验

在室内水泥池用淡水和海水培育美洲鲥(Alosa sapidissima)仔鱼,研究两种培育模式下美洲鲥的生长。结果表明,美洲鲥仔稚鱼可较好地适应海水培育环境,经33 d的培育,淡、海水培育模式下美洲鲥平均全长日增长分别为0.965 7 mm和0.922 0 mm,前者略高于后者;成活率分别为70.3%和74.7%,海水培育模式成活率略高于淡水培育模式;仔稚鱼培育期间的生长模型方程分别为Y=9.614 3+0.500 7 X+1.326 6 X2和Y=9.478 3+0.558 4 X+1.038 0 X2(Y为全长,X为日龄)。可见,两种培育模式生长差异不显著,只要生产条件许可,均可采用淡水或海水培育美洲鲥苗种。

A Experiment on Cultivation of Alosa sapidissima Fries with Fresh Water and Sea Water

The larvae and juveniles of Alosa sapidissima were cultivated fries in the indoor concrete ponds with fresh water and sea water.The results showed that fries can better adapt to the sea water environment,and mean daily increase in the length of A.sapidissima in fresh water and sea water were 0.9657 mm and 0.9220 mm,respectively,and the length increase in fresh water model was slightly higher than that in sea water model.Survival rate in the two culture models were 70.3% and 74.7%,respectively,and the survival in sea water model was slightly higher than that in the fresh water.During the cultivation of larvae and juveniles,the growth model equations were Y = 9.614 3 + 0.500 7 X + 1.326 6 X 2 and Y = 9.478 3 + 0.558 4 X + 1.038 0 X2(Y is full-length,and X is days) respectively.No significant difference in the growth of A.sapidissima in two culture models and as long as production conditions permit,fresh or salt water can be used to cultivate the Alosa sapidissima fries.