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1.寄生虫病由聚缩虫、钟形虫、累枝虫等寄生所致。病蟹体表、附肢及鳃出现棕黄色或浅绿色絮状物,行动迟缓,拒食或因蜕壳困难而死亡。该病多发生在有机质含量过高、无水生植物和攀附物的蟹池,尤以春季死亡率较高。防治方法:①放种前注意检疫,蟹种经消毒后放养;改善蟹池条件,清除烂泥,种植水生植物;调节水质。②对染病蟹池每立方米用40～50克甲醛或新洁尔灭20～30克全池泼洒消毒。③每立方米水体用硫酸锌2～3克,或制霉素8～10克全池泼洒。2.蜕壳未遂
1. Parasitic diseases by the parasite, bell-shaped insects, such as parasites caused by the twig. Crab body surface, appendages and gills appeared brownish yellow or light green floc, slow, antifeedant or due to molting difficulties and death. The disease occurred in the organic matter content is too high, no water plants and clinging crab pool, especially in the higher mortality in spring. Prevention and treatment methods: ① put before the release of quarantine, crab species stocked after disinfection; improve crab pool conditions, remove sludge, planting aquatic plants; regulate water quality. ② Crab pool of disease per cubic meter with 40 to 50 grams of formaldehyde or benzalkonium bromide 20 to 30 grams Quanchiposa disinfection. ③ per cubic meter of water with zinc sulfate 2 to 3 grams, or nystatin 8 to 10 grams Quanchiposa. 2. molt unsuccessful