自1986年以来,由于余姚、慈溪市的一些专业户,鱼塘套养河蟹获得丰收,因而调动了周围群众在鱼塘中套养河蟹的积极性。据各地统计,今年全市鱼塘套养河蟹面积达4000余亩,养殖户认为,鱼蟹混养有四大优点:一是可增加收入。在成鱼塘套养河蟹,一般每亩可产成蟹7—10公斤,就可增收200—300元;二 Since 1986, as a result of Yuyao, Cixi City, some specialized households, raising fish crabs bumper harvest, which mobilized the enthusiasm of the surrounding masses of crabs in fish ponds. According to local statistics, this year the city covers an area of ​​4,000 acres of fish ponds crabs, farmers believe that fish and crab polyculture has four major advantages: First, increase revenue. Into the ponds raise crabs, generally per kilogram can produce crabs 7-10 kg, you can increase the income of 200-300 yuan;