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一、第一个发病期——5月下旬至6月上旬 这个阶段发病的南美白对虾主要是放早苗的南美白对虾。一般规格在5—7cm之间。池水水温在23℃—25℃左右。浮游生物繁生迅速,底栖生物密度较高;池水pH值都在8.6以上;水色多呈浓绿或茶褐色。由于大多虾农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;且营养较单一,一些养
First, the first period of onset - the end of May to early June at this stage of onset of white shrimp Penaeus vannamei is put on the main white shrimp. General specifications in the 5-7cm between. Pool water temperature at 23 ℃ -25 ℃ or so. Plankton rapidly proliferate, benthic organisms density is higher; the pH of the water is above 8.6; Aqua mostly dark green or brown. As most of the shrimp farmers are worried about premature feeding of polluting the bottom of the pond and spoiling the water quality, the amount of feeding is often seriously inadequate; and nutrition is more sole and some raising