河蟹是我国淡水水产品中特有的优质产品，养蟹已成为各地农业开发的重头戏。我省是河蟹生产的大省，近几年，虽然养蟹面积和产量有了突飞猛进的发展，但蟹质量却在持续下降。９０年代初期，１５０克以上的蟹可占到总产量的６０％～７０％，近几年１５０克以上的只占到３０％～ Crabs are unique quality products of freshwater aquatic products in our country. Crabs have become the highlight of agricultural development all over the country. Our province is a big province for crab production. In recent years, although the area and output of crab farming have been developing by leaps and bounds, the quality of crabs has continued to decline. In the early 1990s, more than 150 grams of crabs accounted for 60% to 70% of the total output, in recent years more than 150 grams accounted for only 30%