太湖秀丽白虾不同生长阶段主要消化酶活性研究

研究了太湖秀丽白虾（Exopalaemon modestus）不同生长阶段的消化酶活性。结果表明，太湖秀丽白虾的生长可分为3个阶段，体质量小于0．1g时，蛋白酶活性维持在较高水平；体质量介于0．1～0．3g之间时，蛋白酶活性呈现不同程度的下降；体质量大于0．4g以后，蛋白酶活性进一步降低；其中脂肪酶、淀粉酶和纤维素酶活性均很低。成虾肝胰腺、胃和肠3种不同消化器官的消化酶活性差异显著，蛋白酶活性依次为胃〉肝胰腺〉肠，淀粉酶活性则为胃〉肠、肝胰腺。

Activities of main digestive enzymes of Exopalaemon modestus in Taihu Lake at different growth stages

Activities of main digestive enzymes of Exopalaemon modestus at different growth stages were studied. The results showed that the growth of E. modestus could be divided into three stages based on the digestive enzymes activity. The first stage was when the body weight below 0. 1 g and the protease activity continued rising with the increasing size of shrimp. The second stage was when the body weight was 0. 1 - 0. 3 g and the protease activity declined to varying degrees. The third stage was when the body weight was over 0. 4 g and the protease activity reduced further. Additionally, the activities of lipase, amylase and cellulose were very weak. There was significant difference among the digestive enzyme activities of three different digestive organs of hepatopancreas, stomach and intestine in adult shrimps. The order of protease activity from strong to weak was stomach 〉 hepatopancreas 〉 intestine, and the order of amylase activity was stomach 〉 intestine, hepatopancreas.