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随着国内水产养殖业的发展 ,养殖对象、规模日益扩大 ,而生产中遇到的病害问题则呈多样化 ,且不易解决。其中如细菌性、病毒性等病害的感染机率较大 ,而抗生素的大量使用 ,不仅使一些致病菌产生较强的抗药性 ,同时也影响了鱼肠道内的有益菌群的正常生长 ,引起肠道内菌群生态的
With the development of aquaculture in China, the target of breeding is expanding day by day. However, the problems encountered in production are diversified and not easily solved. Among them, such as bacterial, viral and other diseases, a greater chance of infection, and the extensive use of antibiotics, not only some of the pathogens have a strong resistance, but also affect the fish intestinal normal flora growth, causing Intestinal microflora ecology