卵形鲳鲶消化酶活性的研究I．成鱼和幼鱼消化酶活性在不同消化器官中的分布及其比较

比较研究了卯形鲳够（Trachinotus ovatus）成鱼和幼鱼阶段消化酶（蛋白酶、淀粉酶、脂肪酶）在不同消化器官中的活性。结果表明：1）成鱼蛋白酶在不同消化器官中的活性大小依次为胃〉前肠〉中肠〉幽门盲囊〉后肠〉肝；淀粉酶活性为前肠〉后肠〉幽门盲囊〉中肠〉肝〉胃；脂肪酶活性为前肠〉中肠〉后肠〉幽门盲囊〉肝〉胃。2）幼鱼蛋白酶在不同消化器官中的活性大小依次为胃〉肠〉幽门盲囊〉肝；淀粉酶活性为肠〉幽门盲囊〉肝〉胃；脂肪酶活性为肠〉幽门盲囊〉肝〉胃。3）成鱼不同消化器官中蛋白酶和淀粉酶的活性均小于幼鱼，成鱼胃和幽门盲囊的淀粉酶活性与幼鱼的差异显著；幼鱼胃脂肪酶活性大于成鱼，但其他器官的活性均小于成鱼。卵形鲳鳕幼鱼不同消化器官中的3种消化酶活性大小顺序与成鱼基本相似。

Study on digestive enzymes activities of Trachinotus ovatus I. Comparison of their distribution in different digestive organs of adult and young fish

A comparative study was conducted on the activities of digestive enzymes in different digestive organs of adult and young Trachinotus ovatus. Results show that ： 1 ） For adults, the order of protease activity from strong to weak is ： stomach 〉 foregut 〉 midgut 〉 pyloric caecum 〉 hindgut 〉 liver ; amylase activity ： foregut 〉 hindgut 〉 pyloric caecum 〉 midgut 〉 liver 〉 stomach ; lipase activity ： foregut 〉 midgut 〉 hindgut 〉 pyloric caecum 〉 liver 〉 stomach. 2 ） For young fish, the order of protease activity is ： stomach 〉 intestine 〉 pyloric caecum 〉 liver ; amylase activity ： intestine 〉 pyloric caecum 〉 liver 〉 stomach ; lipase activity ： intestine 〉 pyloric caecum 〉 liver 〉 stomach. 3 ） Both the protease and amylase activities in different digestive organs of adults are weaker than those in young fish, and there is significant difference in amylase activity in stomach and pyloric caecum between adult and young fish （ P 〈0. 05 ）. The lipase activity in stomach of young fish is stronger than that in adults but weaker than that in the other digestive organs of adults. The order of digestive enzyme activity in young fish is similar with adults.