【摘要】 以磷酸二氢钙为磷源,制成磷水平为0.83%、1.07%、1.25%、1.38%、1.59%、1.82%和2.03%的7种饲料,并以此饲料投喂克氏原螯虾幼虾(5.02±0.51g)70d。试验结果表明:饲料磷水平对克氏原螯虾的增重率、特定生长率、饲料系数影响显著,随着磷水平的增加,增重率和特定生长率逐渐升高,当磷水平为1.82%时达到最大,然后随着饲料磷含量的继续增加,这些指标逐渐降低;饲料系数的变化趋势与增重率和特定生长率相反;试验各组间成活率没有显著差异。全虾粗灰分和磷含量与饲料磷水平呈正相关;随着磷水平的升高,全虾粗脂肪含量呈下降的趋势;肝胰腺碱性磷酸酶活性随磷水平的升高而显著降低;以增重率和特定生长率为评价指标,经过折线模型分析得出,克氏原螯虾最适磷需求量分别为1.84%和1.80%。更多还原

【Abstract】 A growth trial was conducted to evaluate the optimum requirement of dietary phosphorus for juvenile red swamp crayfish,Procambarus clarkii.Triplicate groups of juvenile red swamp crayfish(initial mean weight:5.02±0.51 g,mean±SD) were fed diets containing different levels of phosphorus(0.83%,1.07%,1.25%,1.38%,1.59%,1.82% and 2.03%) for 70 d.The results showed that both the weight gain and specific growth rate increased significantly with increasing dietary phosphorus up to 1.82% and then decreased beyond this level.Feed conversion ratio decreased significantly with increasing dietary phosphorus level up to 1.82%.Dietary treatments did not significantly affect survival rate.Body composition analysis showed that the whole-body ash and phosphorus contents were significantly affected by dietary phosphorus levels.Dietary phosphorus levels also had distinct effects on hepatopancreas alkaline phosphatase activity.Broken-line analysis based on weight gain and specific growth rate indicated that the minimum phosphorus requirement for the optimal growth of juvenile red swamp crayfish were 1.84% and 1.80%,respectively.更多还原