岳阳市水产研究所河蟹组在该所一个400亩的精养湖泊中进行河蟹养殖试验。1990年7月向该湖投放蟹种6.5公斤,1991年起捕成蟹650多公斤,产值3.6万多元,纯利3.3万多元,使该湖利润由过去的3万元左右增加到6万多元,增加1倍多。该湖面积400亩,水深1—3米,过去一直单养鱼类,每年产鲜鱼40一50吨,利润一直徘徊在3万元左右。岳阳市水产研究所河蟹组技术人员通过对该湖调查发现,该湖虽然没有河蟹的主要饵料水草,但有丰富的 Yueyang City Institute of Fisheries crab group in the 400 acres of intensive lake crab farming experiments. In July 1990, 6.5 kilograms of crabs were planted in the lake. Over 650 kilograms of crabs were harvested in 1991, with a value of over 36,000 yuan and a net profit of over 33,000 yuan. The profit of this lake increased from 30,000 yuan in the past to 60,000 yuan Multiple, more than doubled. The lake area of ​​400 acres, 1-3 meters deep, in the past has been a single fish, 40 tons of fresh fish each year, the profit has been hovering at 30,000 yuan. Yueyang City Institute of Fisheries River crab group of technicians through the lake survey found that although the lake does not have the main bait Crab grass, but rich