倒刺鲃的胚胎发育及水温对胚胎发育的影响

Embryonic development of Spinibarbus denticulatus (Oshima) and the effect of water temperature on the embryonic development

对倒刺鲃的胚胎发育进行连续跟踪观察,并探讨了水温对其胚胎发育的影响。结果表明:水温(25±0.5)℃时,孵化时间为53.43 h;胚胎发育过程中出现克氏囊。水温21～33℃条件下,倒刺鲃的胚胎均能孵化,水温(x)与孵化时间(y)成极显著的负相关关系:y=235.72 e-0.056 6x,P<0.01;水温与积温的关系为:y=7 519.4x-0.519 2,P<0.01。孵化率(y)与水温(x)相关关系式为:y=-1.665 5x2+88.621x-1 091.5,由曲线方程可以推算出胚胎发育的适宜水温范围为23.4～29.8℃,通过曲线求导数推算极值的方法,求得胚胎发育的最适水温为26.6℃。

The embryonic development were observed continuously ,and the effects of water temperature on the embryonic development were disecussed. The experimental results showed that hatching time was 53.43 h at the water temperature （25-0.5）℃,and there was Kuppfer,s vesicle in embryonic development. The whole development process could be performed at water temperature between 21-33℃C. There were significant negative correlation between embryonic development time （y） and water temperature （x）：y=235.72e^-0.0566x,p〈0. 01,and between water temperature （x） and the accumulative temperature （y）.y=7 519.4x^-0.5192 ,P〈0.01,in the water temperature range of 21-33℃. The correlation between hatching rate（y） and water temperature（x） can be expressed as follow：y =-1. 665 5x2＋88. 621x-1 091.5. From this equation,the suitable water temperature range for embryonic development was estimated to be 23.4-29.8℃,and the optimal water temperature was also estimated to be 26.6℃ at which the hatching rate was the highed.