Commercial prawn and fish aquaculture in Andhra Pradesh, Gujarat, and Tamil Nadu faces severe yield losses from emerging bacterial, microsporidian, and abiotic water quality disorders. This guide synthesizes field-validated, Coastal Aquaculture Authority (CAA) approved biological interventions — eliminating banned antibiotics like enrofloxacin and oxytetracycline.
Etiology: EHP Microsporidian + Opportunistic Vibrio
White fecal strings floating on feeding trays, midgut epithelial sloughing, and rapid 50% feed drop. Antibiotics cause fatal hepatopancreas necrosis.
Etiology: Nitrification Collapse / Feeding Surplus
Un-ionized NH3 > 0.05 ppm damages delicate gill lamellae, causing shrimp gasping, anorexia, and sudden mortality during aerator stops.
Etiology: Vibrio harveyi & V. parahaemolyticus
Green night luminescence, red discoloration of pleopods, melanized hepatopancreas, and rapid mortality within 48 hours.
Etiology: Anaerobic Organic Sediment Reduction
Black soil trenches, rotten egg odor, and lethal Hâ‚‚S seepage forcing shrimp to surface at night. Destroys benthic feeding.
Etiology: Mg:Ca < 2.8:1 / Potassium Osmotic Deficit
Paper-thin carapaces, arched spinal paralysis, and molt entrapment mortalities in low-salinity and borewell ponds.
Use the interactive Pond Doctor diagnostic engine developed by Next Farm Bio Sciences to enter your pond area, water depth, and observed pathology symptoms for instant volumetric allocation.