Limits for Ammonium in fishing waters

Official Limit Values for Ammonium in Fish Waters

1. As NH₄⁺ (Ammonium Ion)

• Salmonid waters (e.g., trout, salmon):
  • Guideline value (I): ≤ 0.04 mg/l NH₄⁺
  • Limit value (G): ≤ 1 mg/l NH₄⁺
• Cyprinid waters (e.g., carp, crucian carp):
  • Guideline value (I): ≤ 0.2 mg/l NH₄⁺
  • Limit value (G): ≤ 1 mg/l NH₄⁺ 

2. As NH₄-N (Ammonium Nitrogen)

Conversion: NH₄-N = NH₄⁺ × 0.776

• Salmonid waters:
  • Guideline value: ≤ 0.031 g/m³ NH₄-N (0.04 × 0.776)
  • Limit value: ≤ 0.776 g/m³ NH₄-N (1 × 0.776)
• Cyprinid waters:
  • Guideline value: ≤ 0.155 g/m³ NH₄-N (0.2 × 0.776)
  • Limit value: ≤ 0.776 g/m³ NH₄-N (1 × 0.776)