Use this calculation to compare aquaculture production, feeding, growth, water-quality, or hatchery measurements collected with the same definitions and units.

Total Ammonia Nitrogen Mg Per Liter (mg/L)

Required number in mg/L.

Unionized Fraction Percent (%)

Required number in %.

The cited overview of Ammonia supplies background for the terminology and domain context used by this tool.^[1]

Apply a temperature-, pH-, and salinity-appropriate NH3 fraction to TAN. The result remains on a nitrogen-mass (NH3-N) basis, not molecular NH3 mass; obtain the fraction from a valid external model or table. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Unionized Ammonia Nitrogen Mg Per Liter (mg/L)

Returned number in mg/L.

• Species, life stage, temperature, salinity, system design, sampling method, and management practice can materially change aquaculture measurements and suitable operating ranges.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Complement the calculation with calibrated water-quality instruments, representative sampling, feed and mortality records, and species-specific guidance from qualified aquatic-health or production professionals.

• TAN Production

  Estimate total-ammonia-nitrogen loading from daily feed and an explicitly supplied feed-to-TAN factor.

• Temperature Correction Growth

  Apply a user-supplied Q10 growth-rate factor over a temperature difference; this is an empirical extrapolation, not a husbandry recommendation.

• Ammonia Excretion

  Estimate daily total-ammonia-nitrogen excretion from biomass and an externally determined excretion rate.