南美白对虾在经历去年大批发病、死亡,大部分养户亏本,养殖信心大受打击的情况下,今年养殖季节一开始,许多地区如上海、浙江、广东等地区,虾苗养到3～4厘米,还未开始大量投料的情况下,又出现大批死亡,上海南汇新港、奉贤等地发病率高达80%,许多养殖户刚刚淡忘掉去年养殖的惨痛 Penaeus vannamei has experienced a large number of fatalities and deaths last year with most of its family members losing money and their breeding confidence severely hit. As the breeding season started this year, many regions such as Shanghai, Zhejiang and Guangdong have 3 to 4 Cm, have not yet begun a large number of feeding the case, there are a large number of deaths, Shanghai Nanhui Xingang, Fengxian and other places the incidence of up to 80%, many farmers just forgotten the pain of farming last year