养殖密度对史氏鲟稚鱼生长的影响

Effect of stocking density on growth of juvenile Acipenser schrenckii.

养殖密度对史氏鲟生长影响的研究结果表明 ,在养殖密度分别为 0 .2 32、0 .6 6 5、1.34 7和 2 .46 9kg·m-2 的流水环境中 ,各密度组的史氏鲟稚鱼的生长表现为不等速性 ,但生长离散没有加剧 .试验持续 2 8d后 ,各组的生长表现出显著差异 ,生长效率、特定生长率和日增重都随密度的增大而降低 ,而饵料转化率和净增重随密度的增大而增大 .特定生长率 (SGR)与养殖密度 (D)

The effect of stocking density on growth of juveniles Acipenser schrenckii was studied, and the results showed that juveniles Acipenser schrenckii reared for 28 days in a flowing water system under different stocking densities of 0.232,0.665,1.347,and 2.469 kg·m -2 grew in allometry. There were no significant differences between the final and initial SV under the four treatments. The growth efficiency,DWG,NY, and SGR of juveniles were decreased with the increase of stocking densities. However, the FCR and NY were increased with the increase of stocking densities. There were significant differences between these parameters under the low and high densities treatment after 28 days. Moreover, there was a significant negative linear correlation between stocking density (D) and special growth rate (SGR).