水温和盐度对黄姑鱼受精卵孵化的影响

黄姑鱼（Nibea albiflora Richardson）是具海水养殖潜力的高价值经济鱼类。本文研究了不同水温（14~32 ℃）和盐度（5~45）条件下，黄姑鱼受精卵的孵化状况。水温低于17 ℃和高于32 ℃时不能孵化；盐度低于15和高于50时也不能孵化。在海水盐度25时，孵化的适宜水温为20~29 ℃，最佳水温为20~23 ℃；在水温22±0.5 ℃时，黄姑鱼孵化的适宜盐度为25~40，最佳盐度为25。通过均匀设计，分析水温（X1）和盐度（X2）对孵化率（Y）的综合影响，获得最佳回归模型为Y=254-4.52 X1-2.78 X2（R2＝0.8808），水温和盐度对回归的贡献率分别为64.8%和55.1%，预测最佳的孵化条件为水温20 ℃、盐度24。

Effects of Temperature and Salinity on Hatching of Fertilized Eggs of Nibea albiflora

Spotted maigre Nibea albiflora is a fish species that has aquaculture potential in China because of its high market value.The incubation of fertilized eggs was studied at the temperature in the range of 14-32 ℃ and salinity ranging from 5 to 45.Fertilized eggs did not hatch,when the water temperature was below 17℃ or above 32℃.water salinity was below 15 and above 50.With water salinity at 25,the suitable temperature for hatching ranged from 20℃ to 29℃,and the optimum temperature was from 20℃ to 23℃.With water temperature at(22.0±0.5)℃,the suitable salinity for hatching was in the range of 25-40,and the optimum salinity was 25.The optimal regression model was obtained through an analysis of temperature(X1),salinity(X2) and hatching rate(Y) by homogeneous design,which had the following expression:Y=254-4.52X1-2.78X2(R2=0.8808).The regression contribution rates of temperature and salinity were 64.8%,55.1% separately.Model calculation predicted that the optimal hatching temperature was 20℃ and salinity of 24.