盐度和pH对长肋日月贝耗氧率和排氨率的影响

摘要

Juvenile Asian moon scallop Amusium pleuronectes with dry tissue weight of(0.52 ± 0.17)g and(0.68 ± 0.10)g was exposed to salinity of(6,21,26,31 and 36)with ecological method under con-trollable laboratory conditions,to study the effects of salinity and pH on energy metabdism in Ascian moon scallop.The results showed that the oxygen consumption rate and ammonia excretion rate were af-fected by salinity without significance(P>0.05).The oxygen consumption rate was influenced by pH, without significance(P>0.05),with significance in ammonia excretion rate(P<0.05).The peak values of oxygen consumption rate and ammonia excretion rate were observed at salinity of 21 and pH of 9.With the gradient were far away from the peak value,the oxygen consumption rate and ammonia excretion rate were decreased.At the same environmental conditions,the O:N values of Asian moon scallop with larger body weight were lower than in the other one.With the increasing salinity,the O:N values was increased from 14.77 to 16.71,and the O:N values on pH were varied from 10.26 to 14.22.It was found that Asi-an moon scallop was adapted to culture in the shallow sea and bay which were affected by rainwater and human behaviors easily,because the salinity and pH affected the physiological metabolism of the scallop.%采用实验室生态试验法进行了盐度和pH对长肋日月贝能量代谢的研究.试验设定了5个盐度梯度(16、21、26、31、36)和5个pH梯度(6、7、8、9、10),并将试验贝分为A、B组两种规格,其肉干质量分别为(0.52 ± 0.17)g和(0.68 ± 0.10)g.试验结果表明,盐度对长肋日月贝的耗氧率和排氨率影响不显著(P>0.05);pH对该贝的耗氧率影响不显著(P>0.05),但对排氨率影响显著(P<0.05).耗氧率和排氨率峰值分别出现在盐度为21和pH为9时,随着设定梯度偏离该峰值其耗氧率和排氨率均为下降趋势.在同一环境条件下,体质量较大的B组贝其耗氧率和排氨率较A组贝小,体质量与耗氧率和排氨率之间呈负相关.随着盐度的增高,氧氮比缓慢上升,比值为14.77~16.71;pH为6~9时,氧氮比随pH上升而变大,pH>9时氧氮比则急剧下降,比值为10.26~14.22.在一定范围内,盐度和pH对长肋日月贝的生理代谢影响较小,适合于沿岸浅海或海湾内进行人工养殖.