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笔者在养蟹区调查和诊治蟹病时发现,目前大多数蟹池都发生蟹病,且较为严重,有暴发的趋势,其特点:一是发病率高,养蟹区发病塘口占70%以上;二是病程短,一旦发病即出现死蟹,3—4天内即达死蟹高峰;三是死亡蟹数量多,一般塘口每亩每天都有死蟹10只左右,高的达数十只甚至百只以上;四是蟹病的类型复杂,病毒性、细菌性和寄生虫性疾病都有,发病蟹症状不明显,主要是几种疾病并发,诊治较为困难;五是复发率高,一个疗程治疗后,时间不长往往又出现复发现象。
The author in the crab area investigation and diagnosis and treatment of crab disease found that most of the crab pool crab disease occurs, and more serious, there is an outbreak of the trend, its characteristics: First, the incidence is high, the incidence of crabs Tangkou accounted for more than 70% ; Second is the short course of the disease, once the incidence of dead crabs, that is, reached the peak of crabs within 3-4 days; Third, the death of crabs and more, generally Tangkou per acre dead crab every day about 10, up to dozens of Even more than one hundred; four is the type of crab disease is complex, viral, bacterial and parasitic diseases are, the symptoms of crab is not obvious, mainly the occurrence of several diseases, diagnosis and treatment is more difficult; five high recurrence rate, one After the course of treatment, the recurrence of symptoms often occurs after a short period of time.