bacterial infection on black tiger shrimp

this was taken in one of my clients ponds in Gudur, INDIA... this kind of disorder comes when ur pond is loaded with bad bacterias coming from feed wastes, amonia accumulation in the ponds due to shrimp waste, plankton crash, feed waste, and chemical residues applied to the pond... how to overcome this problem: contact Ronald O. Canlas 09182919494 canlasro@yahoo.com.ph