Effects of temperature on survival and growth of Paphia textile juveniles

In this study, we observed the effects of temperature on the survival and growth of Paphia textile juveniles by using experimental ecological methods, so as to provide references for the selection of the intermediate breeding site of the juveniles. The results show that: 1) The 48 h semi-lethal low and high temperatures were 4.95 and 33.39 ℃, respectively; the semi-lethal low and high temperatures at 96 h were 8.68 and 32.49 ℃, respectively; the 15 d semi-lethal low and high temperatures were 12.09 and 31.02 ℃, respectively. 2) At 10 ℃, the juveniles all died on the 10^th day, and at 32 ℃, the survival rate of the juveniles on the 15^th day was only 16.67%. 3) Taking the high and low temperatures of 50% of individuals which survived stably within 15 d as the critical temperature for survival, we found that the suitable survival temperature range of the juveniles was 12.09–31.02 ℃. Based on the group or groups with the highest survival rate (No significant differences between groups), the most suitable survival temperature range of juveniles was 14–28 ℃. 4) Based on the high and low temperatures corresponding to the average daily growth of 30% of the optimal group, the suitable growth temperature range of juveniles was 16.62–31.14 ℃. Based on the group or groups with the highest average daily growth (No significant differences between groups), the most suitable growth temperature range of juveniles was 24–28 ℃, and the optimal growth temperature was obviously biased towards the high temperature side within the suitable survival temperature range. In conclusion, it is inferred that P. textile juvenile is suitable for underwater bottom sowing in the southern sea area with a subtidal water temperature below 31 ℃.