【摘要】 在广西南宁市坛洛镇某水产养殖公司的6口长方形养殖池塘中，放养初始体质量（15.11±0.20）g的黄颡鱼（Pelteobagrus fulvidraco），密度分别为5 000 ind./667 m~2(A组)、10 000 ind./667 m~2(B组)和15 000 ind./667 m~2(C组)，每组设2个重复，常规精养180 d，研究放养密度对黄颡鱼生长、肌肉营养成分、消化酶及抗氧化酶活性的影响。结果发现，A组的增重率显著高于其他密度组（P<0.05），特定生长率显著高于C组（P<0.05），与B组无显著差异（P>0.05）;B组的饲料系数显著低于C组（P<0.05），与A组无显著差异（P>0.05）;B组单位面积产量最高，显著高于A组和C组（P<0.05），较A组和C组分别提高62.36%和19.82%。随着养殖密度的增加，鱼体肌肉的粗蛋白含量逐渐降低，粗灰分和粗水分含量逐渐升高，但组间无显著差异（P>0.05）;A组和B组的肌肉粗脂肪含量均显著高于C组（P<0.05）;A组的脂肪酶、胰蛋白酶和淀粉酶活性最高，均显著高于其他组（P<0.05）。随着放养密度的增加，黄颡鱼肝脏中的SOD和CAT活性先增加后减小，B组最高，C组最低（P>0.05）。综上所述，在以养殖产量和鱼体健康综合考虑的生产实践中，以10 000 ind./667 m~2的养殖密度为宜。更多还原

【Abstract】 Yellow catfish(Pelteobagrus fulvidraco) juveniles with initial body weight of(15.11 ±0.20) g were stocked into six rectangular culture ponds in an aquaculture company in Tanluo Town, Nanning City, Guangxi, at stocking densities of 5 000 ind./667 m~2(group A), 10 000 ind./667 m~2(group B) and 15 000 ind./667 m~2(group C), two replicates in each group, and intensively cultured for 180 d to evaluate effects of stocking density on muscle nutrients, and activities of digestive enzymes and antioxidant enzyme. The results showed that the weight gain rate was significantly higher in group A than those in other groups(P < 0.05), and that the specific growth rate was significantly higher in group A than that in group C(P < 0.05), without significant difference between group A and group B(P > 0.05). The feed conversion ratio was shown to be significantly lower in group B than that in group C(P < 0.05), without significant difference with that in group A(P > 0.05). The maximal yield per unit area was observed in group B, significantly higher than those in groups A and C(P < 0.05), and increased by 62.36% and 19.82% compared with groups A and C, respectively. The fish had gradual decrease in muscular crude protein content, and gradual increase in the ash and moisture contents with the increase in culture density, without significant difference among groups(P > 0.05). There was significantly higher crude lipid content in muscle in groups A and B than that in group C(P < 0.05). The maximal activities of lipase, trypsin and amylase were found in group A, significantly higher than those in other density groups(P < 0.05). SOD and CAT activities in liver of yellow catfish were shown to be first increased and then decreased, with the maximal value in group B and the minimal value in group C(P > 0.05), with the increase in stocking density, in conclusion, the stocking density of 10 000 ind./667 m~2 is appropriate in the production and breeding with the comprehensive consideration of physiological health and yield benefit.更多还原