首先，不宜选择水面承包费过高的池塘养蟹，特别是精养鱼塘更不宜养蟹，因水面承包费高，而且水草、螺类等自然饵料生物太少，不利于养蟹。最好选择大水面围拦养殖，或选用荒芜、半荒芜的沼泽水域稍加改造用来养蟹，这类水域年承包费低，不仅降低了养蟹成本，而且有利于促进河 First of all, it is not appropriate to select crabs with ponds whose surface water contract costs are too high. In particular, intensive fish ponds should not be crab-raised. Because of the high surface water contract costs, too few natural food organisms such as aquatic plants and snails are not conducive to raising crabs. The best choice of large surface pens of aquaculture, or the selection of barren, semi-barren swamp waters slightly modified for crab, this type of water with low annual contracting costs, not only reduces the cost of crabs, but also conducive to promoting the river