EM is an effective microbial flora, and it is a new compound microbial active agent first developed by Ryukyu University in Japan. Its main components are photosynthetic bacteria, yeast, lactic acid bacteria, actinomycetes and fermentative filamentous fungi, belonging to 16 genus, with more than 80 species. Photosynthetic bacteria can cooperate with other bacteria in EM bacteria. Its functions are as follows:

(1) promotes animal growth, improves feed utilization rate, reduces feeding cost (about 15%~30%), shortens breeding cycle and improves economic benefits by more than 30%.

(2) Improve the immune function of fish, reduce the occurrence of diseases and improve the survival rate by about 80%~98%.

(3) Eliminate pollution, improve the feeding environment and degrade harmful substances such as ammonia nitrogen, biogas, nitrite and hydrogen sulfide in water; Decompose bait and organic matter in water, stabilize the pH value of water, remove chemical residues in water and purify water quality; Keep the balance between beneficial bacteria and plankton in water and inhibit the growth of harmful algae.