倒刺鲃的胚胎发育及水温对胚胎发育的影响

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℃。

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

The embryonic development were observed continuously,and the effects of water temperature on the embryonic development were disccussed.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 ℃.There were significant negative correlation between embryonic development time(y) and water temperature(x):y=235.72e-0.056 6x,P<0.01,and between water temperature(x) and the accumulative temperature(y):y=7 519.4x-0.519 2,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.