从2003年开始,由于海区水质逐年恶化,广东、广西和海南等省的对虾育苗普遍遇到难题,在虾苗培育过程中出现的病害较多,且难以控制,造成幼体存活率低、滥用药物和虾苗质量下降等不利局面。尤其是在南美白对虾育苗中,出现了引起幼体大规模死亡的厌食症、黏脏病等危害性较大的疾病, Since 2003, due to the deteriorating water quality in the sea area, prawn nurseries in Guangdong, Guangxi and Hainan provinces have generally encountered problems. More diseases occurred during the shrimp culture and were difficult to control, resulting in low survival rate of larvae and abuse of drugs And shrimp quality decline and other unfavorable situation. Especially in Penaeus vannamei nursery, there have been a large-scale death of larvae occurred anorexia, visceral disease and other more harmful diseases,