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中文摘要：
采用室内实验生态学方法研究了体质量(30.25±2.5)g的哲罗鱼Hucho taimen幼鱼在4个温度(11.5±0.5、14.5±0.5、17.5±0.5,和20.5±0.5℃)下摄食前后的排氨率。结果显示:饱食后,4个温度组哲罗鱼幼鱼的排氨率先升高后降低,其中14.5±0.5、17.5±0.5和20.5±0.5℃组具1个峰值,11.5±0.5℃产生2个峰值,其原因是鱼体内的机械性消化正常启动和化学性消化延迟启动共同作用的结果。4个温度组哲罗鱼幼鱼的排氨持续时间(DNR)随着温度的增加而减小;摄食前后排氨率(NR)与温度(t)之间的拟合方程分别为:NR=0.1427e0.0945t(R2=0.9567,11.5℃【t【20.5℃)和NR=0.3326e0.0905t(R2=0.9211,11.5℃【t【20.5℃)。饱食和空腹时,哲罗鱼的排氨率均随温度的升高而增大,说明哲罗鱼幼鱼对水温变化(11.5~20.5℃)有较好的适应性。
英文摘要：
Ammonia excretion rates were determined in juvenile taimen Hucho taimen(Pallas) with body weight of(30.25±2.5)g at water temperatures of 11.5±0.5℃, 14.5±0.5℃, 17.5±0.5℃and 20.5±0.5℃in t satiation and fasting by an ecological method. The results showed that the ammonia excretion rate were all found to be increased firstly and then decreased in the satiated fish at the test temperatures, one peak at 14.5±0.5℃, 17.5±0.5℃, and 20.5±0.5℃and two peaks at 11.5±0.5℃, which might be due to a normal startup of the mechanical digestion with a lag for the biochemical digestion. The duration of ammonia excretion (DNR) was decreased as temperatures increased in both the satiated fish and fasten fish. In the starvation, the regression equation of ammonia excretion rate (NR) on the temperature(T) was expressed as NR=0.1427e0.0945t(R2=0.9567,11.5℃
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