水温对不同规格糙海参代谢与存活的影响OA

Holothuria scabra,or sandfish,is a commercially valuable sea cucumber species predominantly inhabiting tropical coastal regions.In this study,two laboratory trials were conducted to assess the influence of water temperature and body weight on the metabolism and survival rate of H.scabra.First,a metabolism experiment was conducted with four groups of different body weights,namely,XS[(0.68±0.33)g],S[(13.52±2.64)g],M[(33.43±5.79)g]and L[(51.16±10.06)g]exposed to eight experimental water temperatures(14-35℃),representing the water temperature range in the natural habitat and aquaculture environment of H.scabra in China.Subsequently,four groups of H.scabra were cultured in temperature-controlled tanks at eight experimental water temperatures for 15 days to determine the survival rate.The results showed a power function relation-ship between OCRind/AERind and body weight expressed as Rind=aWb(0<b<1,with the exception of AERind at 35℃).The rela-tionship between body weight-specific OCRmass/AERmass and water temperature also followed a power function,Rmass=aTb(b>1).For all four groups of H.scabra,both OCRmass and AERmass increased with rising water temperature.The max-imum OCRmass occurred at 32-35℃,while the maximum AERmass was observed at 29-32℃,followed by a decrease as the temperature continued to rise.Water temperature had a significant effect on both OCRmass and AERmass across all groups(P<0.05).Furthermore,the interaction between water temperature and body weight had a highly significant effect on OCRmass and AERmass(P<0.01).Q10 indicated that low water temperature had a greater impact on the metabolism of H.scabra than high water temperature.In the survival trial of H.scabra,all individuals in the XS group perished at 14℃,while the L group exhib-ited the highest survival rate at this temperature(83.3%±11.8%).As the temperature increased to 20-32℃,the survival rate for the S,M,and L groups reached 100%;the XS group only achieved 100%survival at 23℃.When the temperature rose to 35℃,survival rates in the XS and S groups dropped to 30.0%±8.2%and 79.2%±5.9%,respectively,while the M and L groups maintained high survival rates of 94.4%±7.9%and 100%.Larger individuals exhibited significantly stronger temperature adapt-ability,particularly under the water temperature conditions of 14℃and 35℃.The study indicates that low temperature has a more significant impact on the metabolism of H.scabra,and larger individuals exhibit stronger tolerance to temperature stress.The optimal water temperature range for the physiological activities of H.scabra is 26-29℃.The suitable survival temperat-ure ranges for juvenile and medium-to-large individuals are 23-32℃and 20-32℃,respectively.These findings provide crit-ical data to support water temperature management in the aquaculture of H.scabra.