放养密度对河蟹育成规格、产量和成活率的影响

研究了高淳池塘生态养殖河蟹放养密度对平均育成规格、产量和成活率的影响。结果表明,河蟹平均育成规格(Y)与放养密度(x)的关系为:Y=215.15-0.007x(R2=0.962)(P<0.05);河蟹产量(Z)与放养密度(x)的关系为:Z=270.97 0.079x(R2=0.960)(P<0.05);河蟹成活率与放养密度的关系差异不显著(P>0.05)。可以根据市场对河蟹规格的需求,调整放养密度,达到养殖效益最大化。在幼蟹规格为120~140只/kg,成活率为75%左右,平均育成规格达到170 g/只以上,高淳河蟹池塘生态养殖目前最佳放养密度不宜超过6 000只/hm2。

Effect of Different Stocking Densitiy on Size, Yield and Survival Rate of Eriocheir sinensis

The efect of different stocking densitiy on size,yield and survival rate of Eriocheir sinensis in Gaochun ecological culture pond were studied.The results indicated that the relationship between size(Y) and stocking density(x) is Y=215.15-0.007x(R2=0.962)(P<0.05);the relationship between yield(Z) and stocking density(x) is Z=270.97 0.079x(R2=0.960)(P<0.05);whereas the relationship between survival rate and stocking density is not significant.Hence,the profit of Eriocheir sinensis culture will reach maximization if the size is suitable for market and the stocking density is improved.It recommended that the size of young crab with 75% survival rate were 120-140 individuals per kg;the size of sale were 170g per individual;and the optimal density wereless than 6000 individuals per hm2.