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梭子蟹自人工育苗至养成商品蟹出池的各个时期均有病害发生,严重时死亡率高达80%以上。其中危害较严重的为细菌性疾病和寄生虫病。 1 弧菌病 1.1 病原及症状病原体为鳗弧菌、副溶血弧菌及溶藻弧菌。在蚤状幼体各个时期均有发生,尤其在各期变态时更为严重, 发病严重时在4～6小时死亡率高达80%以上。具体症状表现为对饵料的捕捉能力下降,甚至消失,趋光性减弱, 幼体活动不正常,严重时胸部及附肢发红。肉眼能观察到其体色浑浊,肠道发黑；镜检,肠道发黑无食物,眼球部溶出组织液,高倍镜压片检查可看到有弧状黑点即弧菌。成蟹养殖过程中,病蟹瘦弱,呈昏睡状,甲壳上往往有感染创伤,解剖蟹血液不凝固或凝固很慢,高倍镜观察血液可见活动的弧状黑点即弧菌。
The occurrence of disease occurred in all stages of the swimming crab from artificial breeding to product crab. In severe cases, the mortality rate was as high as 80% or more. The most serious of which are bacterial diseases and parasitic diseases. 1 Vibriosis 1.1 pathogens and symptoms of pathogens Vibrio anguillarum, Vibrio parahaemolyticus and Vibrio alginolyticus. In all stages of flea larvae have occurred, especially in the metamorphosis more serious, when the incidence of serious 4 to 6 hours mortality rate as high as 80%. Symptoms manifested as the ability to capture food decreased, or even disappear, phototaxis weakened, larvae are not normal, severe chest and appendages redness. The naked eye can be observed its body color cloudy, gut blackened; microscopic examination, intestinal black without food, eye department dissolve tissue fluid, high magnification ophthalmic examination can see arc black spots that Vibrio. Crab farming process, the sick crab emaciated, was drowsy, carapace infection often traumatized, crab blood coagulation or coagulation is not very slow, high power microscope to see the arc of blood visible black spots that Vibrio.