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1、腐壳病 病蟹步足尖端破损、逐渐成黑色溃疡并腐烂,然后步足各节及背甲、胸板出现白色斑点并逐渐变成棕色、红棕色诱斑点,严重时斑点连成不规格形状,边缘呈黑色溃疡中心凹下,甲壳被浸蚀成洞,可见肌肉或皮膜,导致河蟹死亡。该病是由于蟹的步足尖端或甲壳等处受损伤,被细菌感染所致。 预防方法 用生石灰彻底清塘消毒,保持水质清洁,夏季常加注新水,塘底淤泥要控制在10厘米以下;对有蟹病预兆的池塘,用生石灰兑水全池泼洒,呈15～25ppm浓度。 治疗方法 用2ppm漂白粉(含30％有效氯)全池泼
1, the rot of shell disease Crab step foot tip damage, and gradually into a black ulcer and decay, and then walk all sections and carapace, white spots appear on the chest plate and gradually turn brown, reddish brown lure spots, severe spots even into irregular Shape, black ulcer edge was concave, carapace was etched into holes, visible muscles or membranes, leading to crab death. The disease is due to the tip of the crab or carapace and other places damaged, caused by bacterial infection. Preventive measures Clear lime disinfection with clear lime to keep the water clean, often add new water in summer, the bottom of the pond sludge to be controlled at 10 cm or less; for signs of crab disease in the pond, with lime quack Quanchiposa, was 15 ~ 25ppm concentration. Treatment with 2ppm bleach (including 30% available chlorine) Quanchiposa