江苏苏北去年渔用饲料价格较低，淡水鱼类价格平稳，养鱼利润相对于养蟹高。由于盲目扩大养蟹面积，加上蟹病较为严重，养蟹的效益随着规模的扩大而严重下降，出现了不少养蟹亏损户。在这种情况下，有些养蟹者又回过头来，发展常规鱼类养殖，春节前常规鱼种价格上扬，如鲫鱼种 Last year Jiangsu Jiangsu Northern lower feed prices, freshwater fish prices stable, relative to the high profit of fish farming. Due to the blind expansion of crab area, coupled with crab disease is more serious, the benefits of crab with the size of the expansion and a serious decline, there have been many crab losses households. In this case, some crabs turn back and develop conventional fish farming. Prices of conventional fish species rise before the Spring Festival, such as carp species