黄颡鱼幼鱼对蛋白质和脂肪的需要量

在水温23±5℃下，将平均体质量10．32g的黄颡鱼（Pelteobagrus fulvidraco）放养在27个60cm×60cm×120cm的微流水网箱中，饲喂3个蛋白质水平（32．0％、40．0％、48．0％），每个蛋白质水平设3个脂肪水平（3．0％、10．0％和17．0％）的饲料，饲养100d。结果表明：在3．0％脂肪水平下，黄颡鱼摄食含40．0％蛋白质的饲料时，平均末体质量、特定生长率和蛋白质效率显著提高，饲料系数降低（P〈0．05）。在10．0％脂肪水平下，黄颡鱼摄食含48．0％蛋白质饲料时，饲料系数显著降低（P〈0．05），摄食含40．0％的蛋白质饲料次之。黄颡鱼摄食含48．0％蛋白质与3．0％脂肪饲料组和40．0％蛋白质与10．0％脂肪组的干物质消化率最高（P〈0．01）；蛋白质消化率在48．0％蛋白质与3．0％脂肪达到最高（P〈0．01），脂肪消化率均在40．0％蛋白质与10．0％脂肪达到最高（P〈0．01）。实验表明，黄颡鱼幼鱼较为适宜的蛋白质和脂肪需要量分别为40．0％和10．0％。

Requirements of Dietary Fat and Protein Levels for Juvenile Yellow Catfish (Pelteobagrus fulvidraco )

A 3 × 3 factorial feeding experiment was conducted to evaluate the optimal dietary protein and lipid levels of juvenile yellow catfish （Pelteobagrus fulvidraco） with average initial body weight of 10.32 g at water temperature of 23± 5℃. The juveniles were randomly stocked into 27 net cages of each 60 cm × 60 cm × 120 cm with flowing water, and fed nine practical diets containing three protein levels （32.0%, 40.0%, and 48.0%）, and three fat levels （3.0%, 10.0%, and 17.0%） for 100 d. The for 100 days. The results showed that at 3.0% dietary lipid level, the significantly higher final body weight, and specific growth rate and lower food conversion ratio were found in the fish fed the diet containing 40.0% protein and 3.0% fat levels compared with other protein levels （P〈0.05）. At 10.0% dietary lipid level, significantly lower food conversion ratio was observed in the fish fed the diet containing 48.0% and 40%pro- tein level （P〈0.05）. The best apparent digestibility of dry matter was found in the fish fed the diet containing 48.0% protein and 3.0% fat levels and 40.0% protein and 10.0% fat levels （P〈0.01）. There was the maximal protein digestibility in the fish fed the diet containing 48.0% protein and 3.0% fat levels （P〈0.01）. Fat digestibility was the best in the 40% protein and 10% fat group （P〈0.01）. It is suggested that the requirement of the juvenile yellow catfish be 40.0% for protein and 10.0% for fat.