微生态制剂又称益生素、活菌制剂或EM(EffectiveMicroorganisms).是一类能有效促进机体生长,调节肠道微生态平衡的添加剂,具有保健、促生长、无副作用等特点。1微生态制剂的开发意义在养殖业中,抗生素作为饲料添加剂被长期使用,抗生素的大量使用,不仅使致病菌产生抗药性。同时,也影响了动物肠道内有益菌群的正常生长、引起肠道内菌群生态失调,使机体免疫力下降,而且易残留、通过食物链而影响人类健康和生态环境。因此,应减少抗生素在病害防治中的运用。在这方面,国内外学者进行了深入研究,期望寻找一种无污染、无残留、 Microecology agents, also known as probiotics, viable agents or EM (Effective Microorganisms) are a class of additives that can effectively promote the growth of the body and regulate the intestinal microflora balance, with health care, growth promotion and no side effects. 1 probiotics in the development of significance In the aquaculture industry, antibiotics as long-term use of feed additives, the extensive use of antibiotics, not only pathogenic bacteria resistant. At the same time, it also affects the normal growth of beneficial bacteria in the intestine of animals and causes the imbalance of flora in the intestine, which leads to the decrease of immunity and easy to remain, which affects human health and ecological environment through the food chain. Therefore, we should reduce the use of antibiotics in disease prevention and control. In this regard, domestic and foreign scholars conducted in-depth study, looking forward to looking for a pollution-free, no residue,