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.