近年来河蟹养殖发展迅速,在养殖面积扩大、养殖总量提高的同时,出现了河蟹发病率高、上市规格小、商品率低等现象,直接影响养殖效益。为保证河蟹养殖健康发展,提高养殖效益,要重视以下四改工作。 一、改小水体养殖为大水面养 In recent years, the rapid development of crab farming, breeding area in the expansion, raising the total breeding at the same time, there has been a high incidence of crabs, the listing of small size, low commodity rate, a direct impact on farming efficiency. In order to ensure the healthy development of crab farming and improve the breeding efficiency, we should attach importance to the following four reforms. First, to change the water culture for the large surface water