循环水养殖系统中饲养密度对罗非鱼幼鱼生长及经济效益的影响

为探讨养殖密度对循环水养殖系统中罗非鱼幼鱼的影响，选取了同批次的罗非鱼幼鱼进行50天的饲养，测定了4组不同养殖密度梯度下幼鱼的生长指标的变化，并计算了不同工况下的经济效益。结果表明，养殖密度对罗非鱼幼鱼的生长有一定的影响，随着养殖密度的增大，幼鱼的成活率及最终平均体重和体长都呈现出下降的趋势，特定生长率、日平均增重、生长效率、肥满度等生长指标也显示出相似的规律，密度最低的A组各生长指标显著高于密度最高的D组，密度过高会抑制罗非鱼幼鱼的个体生长速度。养殖经济效益分析表明C组产量最高，是较适宜的养殖密度。

Effect of stocking density on growth and economic benefit of juvenile Oreochromis niloticus in recirculating aquaculture system

In order to discuss the effect of breeding density on juvenile Oreochromis niloticus in recirculating aquaculture system, the same batch of juvenile Oreochromis niloticus were feeding. The change of growth indicators were measured under four different groups, and the economic efficiency was calculated. Results show that the breeding density has a certain influence on the growth of juvenile Oreochromis niloticus. Along with the rising of the breeding density, the survival rate of juvenile fish and the final average weight and body length, showed a downward trend, and specific growth rate, average weight, growth efficiency, fat full growth index also showed similar rules, such as the growth indicators of the lowest density of A group was higher than the highest density of group D. High density would inhibits the growth of juvenile Oreochromis niloticus. Economic benefit analysis shows that the yields of group C was highest, which was more suitable for the breeding density.