饲料中钙、磷和水体盐度对南美白对虾幼虾生长的影响

用不同钙、磷含量的配合饲料在不同的盐度水体中对南美白对虾幼虾 (Penaeus vannamei)进行饲养试验.试验采取 L9(3 4),磷添加量设 3个水平 0%, 0.75%, 1.5%;钙添加量设 3个水平 0%, 0.75%, 1.5%;水体盐度设 3个水平 4, 17, 30.结果显示,各因素对南美白对虾体质量日增率、饲料系数、成活率的影响大小为盐度 >磷 >钙,对蛋白质效率的影响大小为盐度 >钙 >磷.盐度 4时,不添加钙的组体质量日增率、饲料系数、成活率和蛋白质效率最差;盐度 17时,饲料中磷的添加非常重要.南美白对虾幼虾最适的生长因素是盐度为 17,钙添加量为 1.5%,磷添加量为 1.5%

Effect of dietary calcium phosphorus and environmental salinity on growth of juvenile Penaeus vannamei

This experiment was conducted on three factors of growth in juvenile Penaeus vannamei by using the L9(34) table of orthogonal design for three levels of calcium supplements (0%, 0.75%, 1.5%) , three levels of phosphorus supplements (0%, 0.75%,1.5%) and three environmental salinity levels(4, 17, 30) .Results show that the effect on weight gain, feed conversion ratio and survival rate were as follows: salinity > phosphorus> calcium , the effect on protein efficiency ratio were: salinity > calcium > phosphorus, in the range of the factor levels. A diet without Calcium Supplement had by far the lowest growth, surival rates and food conversion in salinity 4 group. The phosphorus dietary supplement had a major effect on growth in the salinity 17 group. An orthogonal design was employed to determine optimum levels for environmental salinity (17), phosphorus supplements (1.5%)and calcium supplements (1.5%).