春末夏初常见河蟹病害主要有纤毛虫病、蜕壳不遂、水肿病,现将它们的症状及防治方法介绍如下,供广大养殖户参考:一、纤毛虫病。病蟹体表、附肢及鳃出现棕黄色或浅绿色絮状物。病蟹活动迟缓,食欲减退,拒食或因蜕壳困难而死亡。该病多发生在有机质含量过高,无水生殖物和攀附物的? Early spring and early summer crab disease common ciliates, calamity disease, edema disease, now their symptoms and prevention methods are described below, for the majority of farmers reference: First, ciliates disease. Crab body surface, appendages and gills appear brown or light green floc. Crab disease slow, loss of appetite, antifeedant or due to molting difficulties and death. The disease occurred in the organic matter content is too high, anhydrous genitalia and clinging substances?