Effect of high temperature on survival,oxygen consumption and ammonia-N excretion in yesso scallop Mizuhopecten yessoensis
HAO Zhen-lin,DING Jun,BEN Yue,CHANG Ya-qing
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Key Laboratory of Mariculture&Stock Enhancement in North China's Sea,Ministry of Agriculture,Dalian Ocean University,Dalian 116023,China
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Issue Date
2019-05-01
Abstract
In this study,two experiments were conducted to investigate the effects of high temperature on survival, oxygen consumption and ammonia-N excretion of yesso scallop Mizuhopecten yessoensis.In the first experiment,the yesso scallop held at water temperature of 15℃(as control)were abruptly transferred to 20,22,24 and 26℃,and the survival were observed at exposure of 8,12,24,48 and 96 h.In the second experiment,the scallop were acclimatized to the different water temperature(20,22,24 and 26℃)and then maintained for 7 days.The results showed that the yesso scallop had survival of 82.29%at sudden change in water temperature from 15℃ to 24℃during the 96 h exposure periods in the first experiment,without significant differences during various exposure periods(P＞0.05).However,the scallop exposed to 26℃ showed survival rate of 0 after 12 h exposure,significantly lower,and with 8,12,24,48 and 96 h lethal temperature for 50%(LT50)of 27.52,24.41,24.37,24.24 and 23. 81℃,respectively.In the second experiment,the survival(26.13%)was significantly lower at 26℃ than at other temperature,the peak survival(100%)at 15℃.Furthermore,high temperature led to significant influence on the oxygen consumption and ammonia-N excretion(P＜0.05),with the maximal oxygen consumption rates at 22℃and the maximal ammonia-N excretion rates at 20℃.The relationship between temperature(t)and oxygen consumption rate(RO)or ammonia excretion rate(RN)were described as RO=-0.1976t2+1.2531t-0.4885(R2= 0.973,n=15)and RN=-0.7373t2+4.5917t-1.3133(R2=0.8047,n=15),respectively.
HAO Zhen-lin, DING Jun, BEN Yue, CHANG Ya-qing.
Effect of high temperature on survival,oxygen consumption and ammonia-N excretion in yesso scallop Mizuhopecten yessoensis[J]. Journal of Dalian Fisheries University, 2013, 28(2): 138-142
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