温度对斑点叉尾[鱼回]幼鱼耗氧率和氨氮排泄率的影响

采用封闭流水式装置,研究斑点叉尾鱼回]幼鱼(Ictalurus Punctatus)(约9~11 g)在不同温度条件下(18,22和26℃)的耗氧率和氨氮排泄率变化情况。结果表明,在18,22和26℃时斑点叉尾鱼回]幼鱼的耗氧率分别为(171.66±33)mg/(kg·h),(97.22±26)mg/(kg·h)和(171.83±44)mg/(kg·h),26℃处理组的耗氧率最高,与22℃处理组具显著差异(P<0.05);氨氮排泄率也表现出随水温的升高而升高的趋势,18,22和26℃时其氨氮排泄率分别为(0.40±0.01)mg/(g·h),(0.44±0.01)mg/(g·h)和(0.58±0.01)mg/(g·h)。在22~26℃,斑点叉尾鱼回]幼鱼的耗氧率和氨氮排泄率均随温度升高而升高。

Effect of Temperature Onoxygen Consumption Rate andAmmonia Excretion Rate of Juvenile Ictalurus Punctatus

To provide basic data for the artificial breeding and nutritional research for Juvenile Ictalurus Punctatus,the effect of different water temperatures(18,22,and 26℃)on the ammonia excretion rate and oxygen consumption rate of the fish with body weight from 9 g to 11 g were studied by closed-flow method.The results showed that the average ammonia excretion rate of juveniles I.punctatus at 18℃,22℃,and 26℃was(171.66±33)mg/(kg·h),(97.22±26)mg/(kg·h),and(171.83±44)mg/(kg·h),respectively.The oxygen consumption rate was the highest when the water temperature was at 26℃,which had a significant difference with the treatment group at 22℃(P<0.05).The ammonia excretion rate at 18,22,and 26℃was 0.40±0.01 mg/(g·h),(0.44±0.01)mg/(g·h),and(0.58±0.01)mg/(g·h),respectively,and increased with the temperature rising.At 22℃-26℃temperature range,the oxygen consumption rate and ammonia excretion rate of Juvenile I.Punctatus,were increased with warming temperature.