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

Gonad Weight Grams (g)

Required number in g.

Body Weight Grams (g)

Required number in g.

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

Express gonad mass as a percentage of whole-body mass. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Gonadosomatic Index Percent (%)

Returned number in %.

• 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.

• Hepatosomatic Index

  Express liver mass as a percentage of whole-body mass.

• Viscerosomatic Index

  Express visceral mass as a percentage of whole-body mass.

• Dressing Percentage

  Calculate dressed yield as a fraction of whole-fish mass under a consistent processing definition.