水体是河蟹赖以生存和生长的环境 ,水体质量直接影响河蟹的养殖产量和经济效益。正常情况下 ,湖泊、草荡等天然大水面都具有自净能力 ,往往水质清新 ,溶氧充足 ,是河蟹生长发育的良好环境。而在集约化养蟹条件下 ,水体中含有大量的动物粪便和残饵以及药物的残留物 ,它们腐败后 Water crabs rely on the survival and growth of the environment, water quality directly affects the production of crabs and economic benefits. Under normal circumstances, lakes, turf and other natural surface water have self-purification capacity, often fresh water, adequate oxygen, is a good environment for the growth and development of crabs. In the intensive conditions of crabs, the water contains a lot of animal manure and bait and the residues of drugs, they are corrupt