Aquaculture

Ammonia Toxicity in Shrimp Aquaculture: Welfare and Management

Elevated ammonia levels in shrimp ponds and tanks cause toxicity, physiological stress, and mortality, representing a key welfare challenge.

Key Facts

Shrimp excrete ammonia as a metabolic waste product
Un-ionized ammonia (NH3) is far more toxic than ionized form (NH4+)
pH and temperature determine the proportion of toxic un-ionized ammonia
Total ammonia nitrogen above 0.1 mg/L causes welfare stress in many shrimp species
Beneficial nitrifying bacteria convert ammonia to less harmful nitrate

Welfare Considerations

Shrimp exposed to sublethal ammonia concentrations show reduced feeding activity, lethargy, impaired immune function, and increased susceptibility to pathogens. Gill damage from ammonia exposure impairs respiration. Chronic ammonia exposure causes cumulative welfare harm even without acute mortality. Welfare-focused ammonia management maintains levels well below toxicity thresholds through feed management, water exchange, and biofilter management.

What You Can Do

Support shrimp welfare standards that include ammonia monitoring requirements
Encourage biofloc and biosecurity systems that control ammonia
Back training for shrimp farmers in water quality management
Choose certified shrimp from farms with documented water quality protocols
Advocate for welfare-based water quality regulations in shrimp production