由于市场需求和比较效益的驱动,1993年以来,各地名特优水产品种养殖发展势头很猛。据不完全统计,全国淡水名特优水产品种养殖面积约达40万公顷,其中河蟹约占一半,甲鱼2000多公顷,鳗鱼8000多公顷。此外,牛蛙、鳜鱼、罗氏沼虾和海水名贵鱼类、贝类、蟹类等养殖品种也逐步形成规模。养殖方式也开始从粗养向精养,从单一的、个体的向集约化、规 Driven by market demand and comparative benefits, since 1993, the development of aquaculture species in all parts of the country has been developing rapidly. According to incomplete statistics, about 300,000 hectares of freshwater aquaculture species are cultivated in the country, of which about half are crabs, more than 2,000 hectares of turtles and over 8,000 hectares of eels. In addition, bullfrogs, mackerel, macrobrachium rosenbergii and marine expensive fish, shellfish, crabs and other aquaculture species also gradually formed scale. Breeding methods also began from crude to intensive, from a single, individual to intensive, regulations