配合饲料中不同蛋白含量对方斑东风螺稚螺生长和体组成的影响

为探讨人工配合饲料中不同蛋白水平对方斑东风螺稚螺生长和体组成的影响。采用蛋白质含量分别是18.58%,24.30%,30.08%,36.44%,42.64%和48.86%的配合饲料进行了试验。试验水温(28.5±1.5)℃,海水盐度1.0178±0.0008,pH值7.9±0.5,试验期6周。结果表明:配合饲料各组中,当蛋白水平高于36.44%(IV组)时,方斑东风螺稚螺壳高和壳宽增长率以及增重率均显著高于18.58%～30.08%组;各组间成活率差异不显著(P0.05)。配合饲料中不同蛋白水平对方斑东风螺肉中水分、灰分和磷的含量均有显著的影响(P0.05),肉中蛋白含量各组间差异不显著(P0.05)。采用折线回归模型分析配合饲料中蛋白水平与增重率的变化关系,通过折线回归方程y1=5.573X-1.84(R2=0.922);y2=2.367X+135.33(R2=0.823)。可见,0.34～1.18 g方斑东风螺稚螺配合饲料中,适宜的蛋白质添加水平为42.78%。

The effect of diet protein levels on growth performance and body composition of Babylonia areolata

The purpose of the study was conducted to evaluate the effect of diet protein levels on growth per-formance and body composition of Babylonia areolata in eighteen glass tanks 54 cm×42 cm×30 cm. Six practical diets （containing 18.58%,24.30% ,30.08% ,36.44%,42.64% and 48.86% protein diet, respectively） were ran-domly fed to triplicate groups of 30 Babylonia areolata （initial mean weight 0.34 ± 0.01 g）each for 6 weeks. Wa-ter temperature was maintained at （28.51.5） ℃,salinity 1.0178 ± 0.0008,pH 7.9 ± 0.5. The results showed that shell-width rate, shell-height rate,weight gain , moisture, crude ash and phosphorus contain of muscle signifi-cantly increased with dietary protein contents （P〈0.05）,but had no significantly influence on survival rate and muscle protein contain （P〉0.05）. Diet protein level over 36.44% with significant effect on morphologic, growth performance, body composition of Babylonia areolata （P〈0.05）. The optimal dietary protein content of Babylonia areolata was determined to be 42.78% based on broken - line regression analysis y1= 5.573X -1.84 （W = 0.922）; y2 = 2.367X ＋ 135.33（R^2 = 0.823）of WG versus.