温度对玫瑰无须鲃胚胎发育的影响

为了探索温度对玫瑰无须鲃(Puntius conchonius)胚胎发育的影响,将玫瑰无须鲃的受精卵置于不同温度培养容器中进行孵化观察。结果显示,在温度为18～32℃的环境条件下,玫瑰无须鲃的胚胎均能孵化,最适孵化温度范围为24～28℃。如果温度高于32℃或低于18℃时,玫瑰无须鲃的胚胎不能孵出仔鱼。在温度为34℃时,胚胎发育到原肠胚晚期全部死亡,温度为16℃时,胚胎发育停止于神经胚期,孵化时间随温度的升高而缩短,呈幂函数相关。玫瑰无须鲃胚胎发育的生物学零度为12.35℃,有效积温为419.40℃.h。

The effect of temperature on embryonic development of Puntius conchonius

In order to explore the effect of temperature on the embryonic development of Puntius conchonius,the embryonic hatching was observed in cultivating container with the different temperatures.The results showed that the embryos could develop when the temperatures ranged from 18 ℃ to 32 ℃,the optimum hatching temperature ranged from 24 ℃ to 28 ℃ and the hatching rate was the highest and the abnormality rate was the lowest.Whereas the larvae was not hatched when temperature was lower than 18 ℃ or higher than 32 ℃.The embryo died overall at late gastrula stage when the temperature was at 34 ℃,the embryonic development stoped at the neurula stage when the temperature was at 16 ℃.The incubation period was reduced with temperature increasing,and there was a power function correlation between the incubation temperature and hatching rate.In addition,the biological zero point of embryonic development of P.conchonius was 12.35 ℃,the sum effective temperature was 419.40 ℃·h.