黄颡鱼幼鱼对蛋白质和脂肪的需要量

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

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60 cm×60cm×120 cm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100 d。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%。

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.