Preparation of pond:
To kill the unwanted fishes Mahua oilcake is applied @ 2,500 kg/ha. Alternatively combination of urea @ 100kg and bleaching powder @ 200 kg/ha can also be used, with urea applied 18 h before the bleaching powder application. In a newly excavated pond 5-7 tonnes cow dung/pig manure and 200-500 kg lime/ha should be applied. To maintain the planktonic population in the pond, organic and inorganic fertilizers like poultry droppings, pig and cow manure may be applied after stocking of juveniles at periodical intervals. In prawn farming Calcium form an important component in moulting process. Therefore after a heavy shower calcium level in the water may decrease which is signaled by lowering of water pH. If the pH decreases below 6.5, the molting process is arrested. For this purpose, 50 kg lime/week should be applied to maintain calcium balance in water.