Aquaculture Water Quality Online Monitoring System >Overview Ammonia nitrogen and nitrite are two critical indicators affecting water quality. Fluctuations in their concentrations not only impact shrimp growth but may also threaten their survival.As a key water quality parameter in shrimp ponds, maintaining ammonia nitrogen within safe levels is essential for healthy shrimp growth and stable high yields. existing in water as free ammonia (NH₃) and ammonium ions (NH₄⁺),