三疣梭子蟹幼体消化酶活力及氨基酸组成的研究

在三疣梭子蟹幼体发育过程中，五种消化酶活力表现出三种变化模式，其中胃蛋白酶和类胰蛋白酶活力呈上升趋势，而且在蚤状幼体Ⅰ期时就较高，淀粉酶活力逐渐减小，纤维素酶和脂肪酶活力极微。氨基酸含量随幼体发育逐渐增加。必需氨基酸中以亮氨酸含量最高，色氨酸含量最低；非必需所基酸中含量最高者为谷氨酸，最低者为胱氨酸。同时单个必需氨基酸含量与必需氨基酸总量的比值（Ａ／Ｅ）在幼体不同发展阶段略有差异，但基本趋于一致。

Studies on digestive enzyme activities and amino acid in the larvae of Portunus trituberculatus

The experimental results indicate that activities of five digestive enzyme showed three different patterns during larval development of Portunus trituberculatus.The activities of pepsin enzyme and tryptase increased along with growth of larval and it were higher in first Zoea stage, and the activities of amylase decreased. The activities of cellulase and lipase were fairly low. The contents of amino acid increased during larval development of the crab. In the total content of amino acid, the highest EAA is Leu, the lowest is Trp; the highest NEAA is Glu, the lowest NEAA is Cys. There were little difference in essental amino acid ratio (A/E) at different stages of larvae.