Successful bioremediation of nitrogenous toxins in shrimp farming grow-out operations

Successful bioremediation of nitrogenous toxins in shrimp farming grow-out operationsIndian shrimp aquaculture provides annual foreign exchange of Rs.20,000 crores,  offer job opportunities to the tune of 7 lakh / year in on and off farm sectors and improve the rural economy. The recent research efforts on intensification in shrimp farming have enhanced the productivity and the farm income. However accumulation of nitrogenous wastes in aquaculture ponds due to uneaten feed and host metabolism is one of the drawbacks of high density shrimp farming. Though the permitted levels of ammonia in shrimp culture ponds is <1 ppm, concentrations of ammonia often reach upto 4 ppm leading to stress to the shrimps affecting their growth and survival, which in turn reduces the shrimp yield by 10 -15 %  which may consequently lead to even total crop loss. Maintaining the optimal environmental quality is the key to reduce the economic loss caused by the environmental stress due to nitrogenous wastes.

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