Calculate aquaponic fish feed conversion ratio, biomass gain, daily feed intensity, and feed cost per kilogram of gain. Enter starting and ending fish biomass, total feed supplied, culture days, and feed price for a practical cycle review.
Biomass gain = Ending biomass − Starting biomass
Feed conversion ratio (FCR) = Feed supplied ÷ Biomass gain
The main result shows kilograms of feed supplied for each kilogram of measured fish biomass gain.
Adjust biomass records for fish removed, added, or lost during the cycle. Comparisons are meaningful only with consistent inventory methods and feed accounting.
Biomass rises from 300 to 720 kg, a 420 kg gain. With 520 kg feed, FCR is 1.24; at $1.35/kg feed, feed cost is $1.67 per kg gain.
No. Reconcile mortality and removals so biomass gain reflects the fish actually produced during the measured period.
It indicates less feed per unit of gain, but health, survival, feed quality, and water quality must also be considered.
Yes. FCR uses feed supplied, so waste worsens the ratio.
Convert average weight and fish count into total biomass for the start and end dates.
A conventional growth FCR needs positive biomass gain; a loss cycle requires a separate mortality and inventory analysis.
| Item | Meaning |
|---|---|
| Starting biomass | Total live fish mass at the beginning |
| Ending biomass | Total live fish mass at the end |
| Feed supplied | All feed issued during the measured period |
| FCR | Feed supplied divided by positive biomass gain |