异育银鲫氨氮排泄与耗氧的研究

Research on ammonia excretion and oxygen consumption in allogynogenetic sliver crucian carp

采用静态试验法对异育银鲫的氨氮排泄与耗氧进行了研究，结果表明：体重4．51—13．05g的异育银鲫，其单位体重排氨率为0．0269—0．0156mgN／（g·h）；溶氧的死亡临界值为0．56—0．25mg／L，窒息点为0．21—0．08mg／L。异育银鲫的呼吸属顺应型，瞬时耗氧速率与溶氧呈线性正相关，溶氧越低，瞬时耗氧速率越小；瞬时耗氧速率随体重的增加而减少；排氨率与体重呈良好的幂函数，其中单位个体排氨率随体重增大而增大，而单位体重排氨率却随体重增大而减小。

Ammonia excretion and oxygen consumption of allogynogenetic sliver crucian carp were studied through static state tests. The results were as follows： ammonia excretion rates in allogynogenetic sliver crucian carp were from 0. 026 9 to 0. 015 6 mgN/（g · h） when the fish weighed from 4.51 to 13.05 g per individual. Critical values and asphyxiating points of dissolved oxygen on allogynogenetic sliver crucian carp were 0.56 -0.25 and 0.21 - 0.08 mg/L respectively. Instantaneous rate of oxygen consumption and dissolved oxygen was positive correlation. The lower dissolved oxygen was, the lower instantaneous rate would be. Instantaneous rate of oxygen consumption would decrease if the weight increased. It was found that the relationship between ammonia excretion rate and weight followed an exponential function law.