河蟹─龄蟹养殖技术国家海洋环境监测中心林凤翱河蟹蟹苗直接在湖泊、水库中放养往往成活率很低，一般仅为１％左右。而且直接放苗，当年还不能产出商品蟹，需经第二年再养殖一年，才能达到商品蟹规格上市。近年来，一些大湖泊采用“放养蟹种”法进行商品蟹生产，即购买经... Crab ─ age-crab farming technology National Marine Environmental Monitoring Center Lin Feng Ao River crabs directly in lakes, reservoirs, stocking often low survival rate, usually only about 1%. And directly Fangmiao, when the product can not produce crabs, re-breeding the year after the second year, in order to achieve market specifications of crabs. In recent years, some large lakes have adopted the “stocking crab species” method for commercial crab production, that is, purchasing ...