questions: asked about remedy for low dissolve oxygen level, dose of calcium carbonate and any contact details with fishery department. 
 answers: told him that low do is due to high temperature climatic condition, flood prone pond contain high organic manure that reduces the do level. apply potassium crystal of 400 gm for 3 bigha pond area at one day interval which will increase the do level and also effective for disease occurence. agri lime at a dose of 10kg per bigha can be applied. contact details of fishery development officer - 6001177354/7578086022