目前，我国水产养殖业已告别短缺经济，由产量速度型向质量效益型转化，水产品市场已由卖方市场转向买方市场，市场消费对养殖经济效益有着至关重要的影响。一是品种效益。养鱼户所养的品种不同，其效益则有明显的差异。例如，一般达到商品鱼规格的鲤鱼每千克６元，可２５０克 At present, China’s aquaculture has bid farewell to the shortage of economy, from the rate of production to quality and efficiency into the aquatic products market has been the buyer’s market, the market consumption of aquaculture economic benefits have a crucial impact. First, the variety of benefits. Farmers raise different varieties of fish, the benefits are obvious differences. For example, carp, which generally reaches the specifications of commercial fish, costs 6 grams per kilogram for 250 grams