一、盛夏氨甲毒症状河蟹爬上岸边,趴在地上,或挺立草头不下水,病蟹食欲较差,四肢无力且柔软,一般以欲蜕壳的河蟹死亡率高,有蜕壳不遂之表象,查看体表,基本上无纤毛虫等寄生,打开甲壳,鳃正常,肝脏正常,心跳正常。二、病因分析1、水温升高,河蟹摄食量增加,投饲量也加大,饲料不新鲜、不卫生,常用腐烂变质的 First, the summer symptoms of ammonia poisoning Crab climbed the shore, lying on the ground, or standing grass does not go to bed, the poor crab disease appetite, limb weakness and soft, generally want to molting crabs high mortality rate, molting is unsuccessful The appearance, view the surface, basically no ciliates and other parasites, open the carapace, gills normal, normal liver, normal heartbeat. Second, the etiology analysis 1, the water temperature, crab consumption increased, the amount of feeding also increased, the feed is not fresh, unhygienic, commonly used spoilage