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我们于2000年在池塘养殖成蟹上,从放养当年早繁蟹苗育出的幼蟹与扣蟹及放养不同密度上进行了对比试验,现将试验结果报告如下:一、材料与方法1、池塘条件。共选择6个池作试验,总面积3.4ha,水深可达1.5米,水源为长江水,水质清新,无污染,各池进排水分开,进排水管口均用双层密眼网扎牢,严防野杂鱼进入,蟹池环境安静,池底淤泥厚0.15米。每个蟹池的四周用硬质塑料板、铁丝和棍棒等建成,地面净高0.6米,地下0.2米,池的四角建成圆弧形。为了防偷,在防逃设施外还建有2
In 2000, we cultured crabs in ponds and compared the crabs with crabs and stockings at different densities. The test results are reported as follows: I. Materials and Methods 1, Pond conditions. Choose a total of 6 pools for testing, the total area of 3.4ha, water depth of up to 1.5 meters, the water source for the Yangtze River water, fresh water, no pollution, the pool into the drainage separately, into the drainage mouth are double- Prevention of wild trash entry, crab pond environment is quiet, the bottom of the mud thickness of 0.15 meters. Each crab pool surrounded by hard plastic plate, wire and clubs and other built, the ground is 0.6 meters high, 0.2 meters underground, the pool built four corners arc. In order to prevent theft, in addition to anti-escalation facilities have built 2