摘要:
于2000年4月至5月，测定了温度对饥饿状态下南方 鲇幼鱼(体质量18.4～36.0 g)的氨氮排泄的影响.在12.5 ℃，17.5 ℃， 22.5 ℃，27.5 ℃和32.5 ℃水温下，南方鲇的特殊体质量排氨率分别为：1.83，3.86 ，5.52，7.37和9.29 mg/(kg*h)，排氨率(AN)与温度[ BF〗(t)显著正相关，其回归关系可用幂函数或直线方程描述，分别为：AN =0.0285 t1.67 (n=40,r=0.902, P＜0.01), 或AN =-2.71+0.368 t(n=40, r=0.851, P＜0.01).通过讨论认为： 温度升高促使南方鲇蛋白质分解代谢的强度增大，从而使氨氮排泄量增多.
关键词:
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鱼类能量学
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排泄
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温度效应
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南方鲇
Abstract:
An experiment was conducted to evaluate the effect of wa ter temperature on ammonia-N excretion rates in starved juvenile southern catfi sh with 18.4～36.0 g of body weight, from April to May, 2000. The specific-wei gh t rates of ammonia-N excretion were 1.83, 3.86, 5.52, 7.37 and 9.29 mg／(k g.h)at 12.5℃, 17.5℃，22.5℃,27.5℃ and 32.5 ℃, respectively. There was a significant corr elation between the rate of ammonia-N excretion (AN) and temperature (t ). Itcan be described as: AN = 0.028 5 t1.67 (n=40, r=0.902, P<0.01), or AN=-2.71 + 0.368 t(n=40,r=0 .851, P＜0.01), respectively. The discus sion suggested that acceleration of protein catabolism in the fish body with inc reasing temperature resulted in increment of the rate of ammonia-N excretion.
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