Effects of Water Temperature on Embryonic Development and Observation on Postembryonic Development of Spinibarbus caldwelli

The effects of water temperature on embryonic development of Spinibarbus caldwelli were studied and postembryonic development was observed.The results showed that:as water temperature increase from 22℃ to 32℃,the embryonic development rate increased linearly and the embryonic development period decreased rapidly from 70.33 h to 35.83 h.There was a significant square curve correlation between hatching rate and water temperature.The suitable and optimum water temperature range was estimated from this relationship to be 24.3℃ to 29.0℃ and 25.6℃ to 27.8℃ based on a hatching rate up to 70% and 80%,respectively.The highest hatching rate would be obtained at 26.7℃.While water temperature varied from 24.2℃ to 33.0℃,the larvae reached the mixed feeding stage at 5th day after hatching(DAH),developed into post-larva stage at 8th DAH and into juvenile stage at 21st DAH,From hatching to the 28th DAH,the larva grew linearly and the daily increment of total length was 0.6 mm.