Think Namibia Aquaponics 2025
Plant to Fish Aquaponics Calculator
Balance plant feed demand with fish biomass · DWC + Gravel

Plant inputs

Set bed size, number of beds, % of area used and feed rates (g/m²·day). Reducing % area is a quick way to match lower fish biomass.

© by Patrick Hilger · Version 1 (2025)

Fish & outputs

Required fish biomass
0.00 kg
Fish mass needed to support plant demand (planning %BW)
Your fish biomass
0.00 kg
From tank 1–3 entries
Biomass gap / surplus
0.00 kg
Blue = surplus, Red = gap
Suggested fish count
0
At reference weight
Plant-demand feed
0.000 kg/day
From DWC + gravel areas
Actual tank feed
0.000 kg/day
Sum of Tank 1–3 feed
TAN-N/day
0.0 g
28.8 g TAN per kg feed (from plant demand)
NO₃⁻/day
0.0 g
NO₃⁻ ≈ TAN × 4.43

Planning feeding rate is within typical 2–6 % BW/day band.

Set feed % per tank based on fish size. Use planning %BW to size biomass for plant demand; use per-tank % to manage actual feeding.

System Notes

TAN (Total Ammonia Nitrogen): amount of ammonia-N released from feed digestion. Using ~28.8 g TAN per kg of 30% protein feed.

%BW/day: percent of total fish biomass fed daily. Typical tilapia grow-out range: 2–6%.

Feeding guidance: higher %BW/day for juveniles/warm water; reduce for larger fish or cooler water. Never overfeed to satisfy plant demand—adjust biomass instead.

Feed rate impact: Feed input directly drives TAN and nitrate output; stable feeding helps maintain biofilter and plant uptake balance.