Fish Stocking Density Calculator

Work out fish stocking density instantly with clear inputs, formula shown and shareable results.

About Fish Stocking Density Calculator

Stocking works backwards from the harvest you can support. Target biomass is volume x safe density, dividing by harvest weight gives the fish needed at harvest, and dividing by expected survival gives the fingerlings to stock. Density is limited by oxygen supply and water exchange, not by space.

Formula

Stocking density

Harvest biomass = volume x density; fish at harvest = biomass / harvest weight; stock = fish at harvest / survival %

Worked example

With the default values below, Fish Stocking Density Calculator returns Fingerlings To Stock of 13,235. Change any input above and every figure here is recalculated in your browser.

Inputs used

Pond Or Tank Volumeminimum 0.1 m3: 600 m3
Target Density At Harvestminimum 0.1 kg/m3: 15 kg/m3
Target Harvest Weight Per Fishminimum 1 g: 800 g
Expected Survivalaccepts 1–100 %: 85 %

Results

Fingerlings To Stock: 13,235
Biomass At Harvest: 9,000.00
Fish Expected At Harvest: 11,250
Stocking Rate: 22.06

Step by step

1Values used
2Stocking density
3Fingerlings To Stock= 13,235
4Biomass At Harvest= 9,000.00
5Fish Expected At Harvest= 11,250
6Stocking Rate= 22.06

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Overstocking causes oxygen crashes and mass mortality, and effluent from intensive systems may need a discharge consent. Match density to your aeration and water exchange capacity.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Overstocking causes oxygen crashes and mass mortality, and effluent from intensive systems may need a discharge consent. Match density to your aeration and water exchange capacity.

Frequently Asked Questions

What density is safe?

Static earthen ponds support 0.5-2 kg/m3, aerated ponds 5-20, and intensive recirculating systems 40-100 kg/m3 with heavy filtration and oxygen injection. Exceeding your aeration capacity risks a total kill overnight.

Should I stock in batches?

Partial harvest and restocking keeps biomass near the system limit for longer and raises annual output, but complicates size grading and disease management.