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规格为 2m× 2m× 1m的 10只网箱中 ,分别放养均重 3 4.3g瓯江彩鲤 (全红 )鱼种 3 60、480、60 0、72 0和 840尾 ,每种密度设置 1个重复。养殖期 195d。实验结束时 ,个体均重分别为 75 6.0 0、73 6.5 5、711.75、70 2 .0 0及 686.90g ,随密度增加而下降。除 840尾 /箱试验组外 ,各密度绝对增重率趋势基本相同 ,以 7、9及 10月份生长较快 ,均在 4g/d以上。单位面积净产量、产投比均以 840尾 /箱试验组为最高 ,分别为 12 8.0 0kg/m2 和 2 .48。各组存活率均在 90 %以上。饵料系数为 1.97～ 2 .0 9。综合考虑生长速度、单位面积净产量、产投比、饵料系数、存活率等因素 ,认为现有的放养规格下 ,每箱 840尾 (2 10尾 /m3) ,是比较好的放养密度 ,能够充分利用水体 ,取得较高经济效益。
The 10 cages with a size of 2m × 2m × 1m were stocked with an average weight of 3 4.3g, 3 60,480,60 0,72 0 and 840 fish of the red carp (all red), one repeat for each density . Breeding period 195d. At the end of the experiment, the individuals weighed 75.60, 73.5, 5,711.75, 70.2 .0 0 and 686.90 g, respectively, decreasing with increasing density. In addition to the 840 tail / box test group, the trend of absolute weight gain rate of each density is basically the same, rapid growth in 7,9 and 10 months, are more than 4g / d. Net output per unit area, production and investment ratio were 840 tail / box test group was the highest, respectively 12 8.0 0kg / m2 and 2.48. Survival rates in all groups were above 90%. The bait coefficient is 1.97 ~ 2.09. Taking into account the growth rate, net yield per unit area, production-to-input ratio, feed conversion coefficient, and survival rate, it is considered that the stocking density of 840 (210 / m3) Make full use of water to obtain higher economic benefits.