罗非鱼是全国各地最重要的养殖品种。特别是近两年,由于国外收购订单多,养殖规模更是迅猛扩大,在种质退化和环境污染的双重胁迫下罗非鱼暴发性鱼病日趋严重,容易给养殖业者造成极大损失。 罗非鱼暴发病发病特点是流行季节长。6月～10月是该病的暴发流行季节。发病时水温多在25? Tilapia is the most important breed throughout the country. Especially in the past two years, due to the large number of foreign acquisition orders, the scale of breeding is rapidly expanding. Under the double coercion of germplasm degradation and environmental pollution, the outbreak of tilapia is becoming more and more serious, which will easily cause great losses to aquaculture producers. The onset of tilapia is characterized by epidemic season. June to October is the outbreak of the epidemic season. Incidence of water temperature more than 25?