The protein contents of the normal larvae decresed and the protease activity increased, the protease activity in intestine was higher than the protease activity in body without intestine from 9 age in days to 22 age in days.

• 9- 22日龄,仔鱼蛋白质百分含量逐渐递减,蛋白酶的活力却明显增强,肠道内的蛋白酶活力高于去肠道鱼体的蛋白酶活力。