作　　者： ; ; ; ; ; ; ;

机构地区： 华东师范大学生命科学学院

出　　处： 《大连水产学院学报》 2007年第2期113-117,共5页

摘　　要： 将施氏鲟Acipenser schrenckii幼鱼在淡水和海水(盐度为28)条件下分别驯养14 d后(水温为20.0±0.2℃),禁食48 h,测定了该鱼的耗氧率和窒息点。结果表明:海水和淡水中幼鱼的平均耗氧率分别为(235.10±37.70)、(202.20±30.12)mg/(kg.h),淡水组显著低于海水组(P<0.05);幼鱼的窒息点分别为(0.94±0.02)、(0.84±0.01)mg/L,淡水组显著低于海水组(P<0.05);在两种试验条件下,幼鱼昼夜耗氧的变化规律均表现出两个耗氧高峰(8:00、22:00)和两个耗氧低谷(18:00、0:00)。由此可知,经过14 d海水养殖,幼鱼的代谢率仍处于较高水平,耐低氧能力还较弱,而生理规律已经与淡水环境中趋于一致。此外,笔者还将本研究结果与其它相关研究结果进行了比较,发现施氏鲟的代谢率高于部分淡水鱼类,但该鱼白天与夜间的平均耗氧率差异不大,其代谢水平变化属于昼夜差异不明显类型。 The oxygen consumption rate and asphyxial point were determined in juvenile Amur sturgeon （Acipenser schrenckii） which had been acclimated to sea water （ a salinity of 28） and fresh water at （20. 0 ±0. 2）℃ for up to 14 days. The fish had a mean oxygen consumption rate of （235.10 ±37.70） mg/（ kg ·h） in seawater, significantly higher than the fish （202. 20 ＋30. 12）mg/（kg·h） acclimated in freshwater （P 〈0. 05） had. Meanwhile, the asphyxiation point was （0. 94 ±0. 02）mg,/L in the fish in seawater, significantly higher than that in freshwater （ 0. 84±0. 01 ） mg/L （ P 〈 0. 05 ）. The peak oxygen consumption occurred at 8：00 and 22：00 in the fish in sea water, and decreased to the lowest at 18：00 and 0：00 for the fish acclimated both in sea and fresh water. Therefore, these results suggested that the tolerance of hypoxia in seawater was still low for the juveniles acclimated to sea water for 14 days, and the physiological responds of the fish acclimated in sea water were similar to those cultured in freshwater. Comparison of this study with other, the resting metabolic rate of Amur sturgeon was higher than that of other freshwater fish.

关 键 词： 施氏鲟 盐度 代谢率 耗氧率 窒息点

领　　域： [生物学] [生物学] [农业科学] [农业科学]