Plan aquaponic balance with ratio guidance for growers. Compare feed, biomass, crops, and water volume. Produce healthier harvests while protecting fish through simple checks.
| Scenario | Fish count | Avg weight (g) | Feed % | Crop group | Supported plants | Plants per fish |
|---|---|---|---|---|---|---|
| Backyard starter | 20 | 250 | 1.5 | Leafy greens | ~72 | ~3.6 |
| Herb-heavy raft | 30 | 300 | 1.2 | Herbs | ~154 | ~5.1 |
| Fruiting focus | 40 | 400 | 1.0 | Fruiting plants | ~72 | ~1.8 |
Examples are illustrative. Use your actual feed rate, crop spacing, and water quality limits for best planning.
Daily feed is the main nutrient engine in an aquaponic garden. The calculator estimates feed from fish biomass and a chosen feeding percentage. Higher biomass or warmer temperatures often increase feed demand, raising available nitrogen for plants. Sudden feed changes can destabilize water quality, so the safety margin helps keep plans conservative.
Feed loading expresses how many grams of feed a square meter of planting can effectively process each day. Dividing daily feed by feed loading estimates supported grow area. Multiplying by planting density converts that area into an expected plant count. This approach aligns well with bed planning, raft footprints, and spacing decisions. When you apply a safety margin, the supported plant count is reduced to protect against missed feedings, pump downtime, and seasonal appetite shifts. For new systems, start with a larger margin, then tighten it after consistent test results and stable nitrate readings. Document harvest weights to confirm nutrient supply matches demand.
Leafy greens typically thrive at moderate nutrient levels and tighter spacing, while fruiting crops usually need more nutrients and wider spacing. Presets provide starting values for feed loading and plants per square meter, but real results improve when you enter your actual spacing and observed growth rate. If plants show pale leaves, reduce density or increase filtration.
The stocking guideline compares estimated biomass to a limit based on tank volume and a selected density value. Utilization above eighty percent signals less buffer for dissolved oxygen swings, solids buildup, and ammonia spikes. If utilization exceeds one hundred percent, reduce fish biomass, increase volume, or improve aeration and biofiltration.
Recalculate whenever fish size, feed type, or season changes. Track daily feed, test water parameters, and note plant performance. Use the target plants field to scale fish counts, then validate with a small trial before expanding. Stable routines and measured adjustments produce reliable harvests and healthier fish.
It is the supported plant count divided by fish count, after applying your safety margin. Use it as a planning ratio, then confirm with water testing and growth results.
Area-based is best for sizing beds, rafts, and spacing. Plant-based is useful when you already know plant count and want a quick check using feed per plant assumptions.
It builds operating headroom for appetite swings, temperature shifts, and small maintenance gaps. A margin reduces the planned plant load so the biofilter and oxygen supply stay stable.
Start by reducing fish biomass or lowering feeding percent. If that is not possible, increase tank volume and aeration, improve solids removal, and expand biofiltration before increasing plants.
No. Presets are starting points. Enter your real plant spacing, observe nutrient demand, and refine feed loading based on harvest quality, nitrate trends, and any signs of deficiency.
Recalculate whenever fish size changes noticeably, feeding schedules shift, or seasons change. Updating monthly is a good baseline, and weekly updates help during rapid growth periods.
Tip: Use consistent units and re-check inputs whenever fish sizes or feeding schedules change.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.