Pathology Monograph • AP-TAN-02
Total Ammonia Nitrogen (TAN) & Nitrite (NO2) Toxicosis in High-Density Shrimp Ponds
In intensive penaeid shrimp ponds stocked at 40 to 80 PL/m2, uneaten feed and metabolic excretion introduce massive organic nitrogen loads. When biological nitrification collapses, un-ionized ammonia (NH3) and nitrite (NO2-) surge to lethal concentrations.
Safe Un-ionized NH3
< 0.02 ppm
Lethal above 0.1 ppm
Safe Nitrite (NO2-)
< 0.2 ppm
Brown blood / gill suffocation
Critical pH Interaction
pH > 8.3
Shifts NH4+ into toxic NH3
✓ Recommended CAA-Approved Nitrification Protocol
Next Converter High-Potency Autotrophic Nitrifiers
Manufactured by Next Farm Bio Sciences (New Autonagar, Vijayawada, Andhra Pradesh). Contains live, stabilized consortia of Nitrosomonas europaea (oxidizes NH3 to NO2-) and Nitrobacter winogradskyi (oxidizes NO2- to harmless NO3-) delivering over 1 x 10^10 CFU/ml.
Active Bacterial Consortia: Nitrosomonas europaea, Nitrobacter winogradskyi, Paracoccus denitrificans
Emergency Curative Dosage (TAN > 1.0 ppm): Apply 2.0 to 3.0 Liters per acre of pond water (1 meter depth) during active aerator operation in morning sunlight.
Maintenance Bio-Filter Dosage: 1.0 Liter per acre weekly from DOC 45 onwards.
Direct Factory Purchase:
Next Farm Bio Sciences (₹1,199 / ₹5,000 INR)