养殖密度对杂交鳢仔鱼生长与存活的影响

Effect of Stocking Density on Growth and Survival of Larval Hybrid Snakehead

在温棚水族箱中养殖杂交鳢仔鱼,养殖密度分别为0.5、1、2、4、8尾/L,共养殖15 d,试验结果表明:养殖密度在0.5～4尾/L之间,杂交鳢仔鱼的最终体重、特定生长率、日增重都随着养殖密度的增大而升高,当养殖密度为4尾/L时,三者达到最大值;进一步增加养殖密度,仔鱼的生长反而下降。高密度组(4、8尾/L)杂交鳢仔鱼个体生长速度离散度明显加大,仔鱼的成活率随养殖密度增加而下降。

Larval hybrid snakehead were stocked and reared in an outdoor tank at a density of 0. 5,1, 2, 4 and 8 ind./L for 15 days. The results showed that final weight, SGR and DWG of snakehead larvae increased with the increasing of density, then reached the highest at the stocking density 4 ind./L. Then the SGR decreased after it reached the peak. The larval in high density groups（4 and 8 ind./L） had great variation in size and growth. The survival rate decreased with stocking density increasing.