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在一年中,南美白对虾有3个容易发病阶段。第一个容易发病阶段在5月下旬至6月上甸。这个阶段发病的主要是放早苗的南美白对虾,一般规格在5-7厘米,水温在23℃-25℃。由于大多数养殖户担心过早投饵容易污染池底,败坏水质,所以投饵量往往严重不足。一些养殖户仅用少量豆饼供虾充饥,虾的体质极差,容易染病。有些养殖户在放苗后即投喂螺蚬等鲜活饵料,常因对鲜活饵科处理不严格,大量浆汁被带入虾池,使水质变差,虾病极易发生。
During the year, P. vannamei has three easy stages of disease. The first prone to disease stage in late May to June Shangdian. The incidence of this stage is mainly put saponin white shrimp, the general specifications of 5-7 cm, the water temperature at 23 ℃ -25 ℃. As most farmers fear that premature feeding tends to pollute the bottom of the pond and spoil the quality of the water, the amount of feeding often is seriously inadequate. Some farmers use only a small amount of bean cakes for shrimp, shrimp poor quality, easy to get sick. Some farmers in the Fangmiao immediately after the feeding of snails and other fresh feed, often due to live bait treatment is not strict, a large number of juice was shrimp ponds, poor water quality, shrimp disease prone.