饲料蛋白水平对罗氏沼虾(Macrobrachium rosenbergii)生长和消化酶活性的影响

探讨了饲料中不同蛋白水平（ω（蛋白）分别为20.2%,29.6%,40.8和51.2%）对罗氏沼虾（Macrobrachium rosenbergii）生长和消化酶活性的影响。结果表明，在本实验范围内，饲料中不同蛋白水平对罗氏沼虾的特殊生长率（YSGR）影响不显著（P＞0.05），对淀粉酶的比活性也无显著影响（P＝0.108），但显著影响类县蛋白酶（P＝0.017)和胃蛋白酶的比活性（P＝0.002），在同一蛋白水平下，淀粉酶比活性最高，其次为类县蛋白酶和胃蛋白酶，3种消化酶的比活性在ω（蛋白）＝51.2％组最高，随着饲料中蛋白水平的上升，3种消化酶的比活性也呈逐渐上升的趋势，而淀粉酶与类胰蛋白酶比活性的比值逐渐下降，表明罗氏沼虾消化酶活性对饲料中蛋白含量有适应性反应。

EFFECTS OF DIETARY PROTEIN LEVELS ON GROWTH AND ACTIVITY OF DIGESTIVE ENZYMES OF GIANT FRESH WATER PRAWN (Macrobrachium rosenbergii)

The Effects of dietary protein levels ( w (protein)=20 2%, 29 6%, 40 8% and 51 2%) on the growth and activity of digestive enzymes of giant fresh water prawn ( Macrobrachium rosenbergii ) are investigated. No significant differences between Y SGR ( P >0 05) and activity of amlyase ( P =0 108) are found among experimental groups with different dietary protein levels. However, dietary protein levels have significant effects on the activity of tryptase ( P =0 017) and pepsin ( P =0 002). At higher dietary protein levels, the activity of pepsin and tryptase increase significantly, while the ratio of the activity of amylase to tryptase decrease. No correlation between growth and activity of digestive enzymes is found in present work.