EM in Fish and Prawn Culture: EM has been used successfully in the culture of Prawns and fishes in many countries and where the yield of prawns have been enhanced significantly. The usefulness of EM in Prawn culture are derived from many benefits. 1.Em reduces the capital outlay by 50% 2.Prawns are healthy with a shining shell. 3.It reduces the quantity of sludge produced. 4.EM eliminates Ammonia, Methane and Hydrogen sulfide, which are common in normal prawn culture. 5.The prawn is much more healthy after using EM, which reduces the cost of antibiotic. 6.The water is clean and it does not require repeated changes. 7.