一、死亡原因 １．缺氧 河蟹喜欢生活在水质清新、溶氧丰富并有一定微流水的环境中。若水中溶氧低于３ ｍｇ／Ｌ时，河蟹不觅食，停止活动。溶氧低于２ｍｇ／Ｌ时，河蟹就会大批窒息死亡。由于一般养蟹池深度较浅，仅达１ｍ左右，池中还留有浅滩供河蟹栖息活动，池中的实际贮水 First, the cause of death 1. Hypoxia crabs like to live in fresh water, dissolved oxygen rich and have some microfluidic environment. If dissolved oxygen in the water is lower than 3 mg / L, crabs do not feed, stop the activity. Dissolved oxygen below 2mg / L, crabs will be a large number of suffocation death. Due to the general depth of shallow crab pool, only about 1m, the pool also has a shallow water for crab habitat activities, the pool of actual water storage