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

Initial Weight Grams (g)

Required number in g.

Final Weight Grams (g)

Required number in g.

Elapsed Days (days)

Required number in days.

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

Compare cube-root body-weight growth per day; weight units must remain grams for comparison across batches. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Daily Growth Coefficient (g^(1/3)/day ×100)

Returned number in g^(1/3)/day ×100.

• 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.

• Condition Factor

  Calculate Fulton's mass-length condition factor for weight in grams and length in centimetres; body shape varies by species.

• Daily Feed Rate

  Convert a chosen daily feeding percentage of live biomass into feed mass per day.

• Specific Growth Rate

  Calculate log-based specific growth rate between two positive fish weights, in percent per day.