壳聚糖对黄颡鱼生长及非特异性免疫机能的影响

Effects of Dietary Chitosan on Growth and Non-specific Immunity of Pelteobagrus fulvidraco

本研究探讨了饲料中添加不同浓度壳聚糖对黄颡鱼(Pelteobagrus fulvidraco)生长性能和非特异性免疫机能的影响。在基础饲料中分别添加0(对照组)、25、50和100 mg/kg的壳聚糖配成4种试验饲料,在水温(22.0±2.0)℃下,分别饲喂平均体重约为7.5 g的黄颡鱼42 d。结果表明,添加25 mg/kg壳聚糖的试验组,其增重率、特定生长率、血清酸性磷酸酶活性、碱性磷酸酶活性、超氧化物歧化酶活性和溶菌酶活性均显著高于对照组(P<0.05),饵料系数显著低于对照组(P<0.05)。其余组同对照间差异不显著(P>0.05)。因此,在黄颡鱼饲料中添加适量的壳聚糖(25 mg/kg)能显著改善其生长性能和增强其非特异性免疫功能。

In this trial, the effects of dietary ehitosan supplementation levels on growth performance and non-specific immunity of Pelteobagrus fulvidraco, were investigated, and four experimental diets were prepared by adding 0 （control group ） , 25,50 and 100 mg/kg chitosan, respectively. The growth trial by feeding fish（ mean body weight 7.5 g） with the four experimental diets for 42 d was conducted under water temperature of（22.0 ±2.0） ℃. The results showed that the weight gain rate, special growth rate, activity of acid phosphatase , activity of alkaline phosphatase , activity of super oxide dismutase and activity of lysozyme of group 25 mg/kg were significantly higher than that of con- trol group（P 〈0.05）, and feed conversion ratio was significantly lower than that of control group（P 〈0.05）. Dietary 50,100 mg/kg chitosan had no significant effect on the growth performance and non-specific immune function （ P 〉 0. 05 ）. Thus adding chitosan in Pelteobagrusfulvidraco feed （25 mg/kg） could appropriately improve their growth performance and non-specific immune function.