一、病害发生的基本情况2005年本市的南美白对虾养殖面积接近5000亩,比2004年新增加近2000亩,主要原因是2004年南美白对虾养殖产量都在400～600千克/亩,虽然后期有的池塘发病死亡,但是都已达上市规格,每亩虾池的经济效益在6000元以上,所以2005年有不少养殖户改养南美白对虾。今 First, the basic situation of disease occurred in 2005, the city of Penaeus vannamei aquaculture area of ​​nearly 5,000 acres, nearly 2,000 acres more than in 2004 increased nearly 200 acres, mainly due to the 2004 Penaeus vannamei production in 400 to 600 kg / mu, although Some pond death later, but have reached the market size, the economic benefits of more than 6,000 yuan per mu shrimp pond, so in 2005 there are many farmers reared P. vannamei. this