1主要症状病蟹行动迟缓,往往十足腾空,在蟹胸部、腹部出现裂痕,但无力脱壳或仅退出部分蟹壳,病蟹背甲上有明显的斑点,全身变成黑色,最终消瘦而死亡。在池水四周或水草上常可以发现患此病的蟹。2发病原因⑴河蟹生长季节,水体中或投喂的人工饵料中,长期缺乏钙、铁等元素的物质,蟹 1 main symptoms of crab slow action, often full vacant, in the crab chest, abdomen cracks, but unable to shelling or just quit part of the crab shell, crab carapace obvious spots, the body becomes black, and eventually lost weight and died . Around the water or plants can often find the disease of crabs. 2 causes ⑴ crabs growing season, water or fed artificial feed, the long-term lack of calcium, iron and other elements of the material, crabs