河蟹的人工育苗因水体小、密度高，生产过程中水体交换频繁，水的自净能力微乎其微，自身污染又处于随时加剧状态，育苗水的pH值、硬度、盐度、温度、溶氧、重金属离子含量等理化指标和微生物种群、质量、数量等生化指标都是依靠人为调控。要育出具有旺盛生命力和优良遗传特性 Artificial breeding of crabs due to small water, high density, frequent exchange of water during production, water self-purification capacity is minimal, their pollution is aggravated at any time, nurturing water pH, hardness, salinity, temperature, dissolved oxygen, heavy metal ions Content and other physical and chemical indicators and microbial populations, quality, quantity and other biochemical indicators are dependent on human regulation. To have a strong vitality and good genetic characteristics