The embryonic development of Penaeus vannamei and effect of temperature and salinity on embryonic development

Based on cultivated Penaeus vannamei, the whole process of embryonic development was observed and described in this paper from egg laying up to larva hatching. The results showed that the whole process of embryonic development took about 12h at water temperature of 29. 51 and salinity of 28. Different water temperatures and salinity significantly affect the hatching time of fertilized eggs and fertilization rate: when water temperature falls from 29.5℃ to 26.8℃, the hatching time increases from 11. 3h to 15h. The optimum water temperature for hatching is 28 - 30 ℃ and the optimum salinity is 27 .93 - 33 .01. When salinity is as low as 22 or as high as 38, fertilized eggs are unable to develop normally.