文蛤池塘养殖密度调控效果比较

应用种群生长与密度关系的规律,对文蛤池塘养殖密度、产量和产品规格的关系进行了比较试验,依据密度制约方程,当养殖密度随个体增长而增大至一定程度并抑制生长速度时,分塘疏养。结果揭示在单位面积毛产量、净产量、总产值、净利润、产量/投放量比等方面,以放养密度8 840粒/m2(680 g/m2)组最好。分塘疏养以放养密度1 253粒/m2(1 724 g/m2)组为好。密度低的池塘内文蛤平均壳长、壳高、壳宽,增重量和增长率均比高密度组大。对文蛤池塘养殖产量、产品规格和产值进行比较分析,对养殖密度调控技术进行了探讨。

Comparison of results on adjusting the cultured density of hard clam (Meretrix meretrix) in ponds

Some experiments on adjusting density of hard clam(Meretrix meretrix) in pond culture were carried out on the basis of the relationship between growth and density.According to the density dependent equation,transporting of clam from one pond to others for sparse culture was applied when the clam grows.The result showed that the pond with the higher density(8 840 ind/m~2 and 680 g/m~2)of hard clam had higher gross and net production,total output value,net profit and the ratio of output to input than the ponds with lower density;and that in the pond with density 1 253 ind/m~2(1 724 g/m~2)was higher than the others with low density in the mode of sparse cultured density; but the average shell length,height,width,size and weight of the hard clams in the pond with lower density were better than those with higher clam density.This study showed that control of the hard clam density in cultured ponds should be a measure to raise the production,quality and value of products.