饥饿和再投喂对鲈鱼稚鱼蛋白酶活力的影响

采用生物化学方法,对饥饿和再投喂的鲈鱼(Lateolabrax japonicus)稚鱼的胃蛋白酶和胰蛋白酶在15.00的盐度条件下进行测定和分析.结果表明,饥饿3 d、饥饿6 d、再投喂3 d的鲈鱼稚鱼,其胃蛋白酶的活力比摄食组高,胰蛋白酶的活力比摄食组低;而再投喂10 d和再投喂17 d的鲈鱼稚鱼,其胃蛋白酶的活力比摄食组低,胰蛋白酶的活力比摄食组高.饥饿组和摄食组的鲈鱼稚鱼,其蛋白酶活力差异显著.由此认为,短期饥饿可能导致鲈鱼稚鱼出现补偿性生长.

Effects of the Starvation and Refeeding on the Proteinic Enzyme Activities of Juvenile Lateolab}ax.japouicus

At the salinity of 15.00,the activities of the pepsin and trypsin of juvenile Lateolabrax japonicus are examined during starvation and refeeding.The tested juvenile Lateolabrax japonicus are domesticated in a short time,and then the hunger experimentation is started.The tested juvenile Lateolabrax japonicus are divided into two groups(the starved group and the feeding group).The course of starvation lasts for 6 days.During the experiment,the juvenile of the starved group are starved 6 days,and then feed the frozen larval chironomid to them.At the same time,the juvenile of the feeding group are fed by the frozen larval chironomid from beginning to end.The results show that the activities of the pepsin of the juvenile Lateolabrax japonicus that are starved 3,6 days and are refed 3 days higher than the feeding group.The activities of the trypsin are lower than the feeding group;but the activities of the pepsin of the juvenile Lateolabrax japonicus that are refed 10,17 days are lower than the feeding group,and the activities of the trypsin are higher than the feeding group.It indicates that the two proteinic enzymes of the starved group are significantly different from the feeding group.According to the results above,it is considered that a short-term starvation can make juvenile Lateolabrax japonicus grow supplementarily.