Fish stocking density calculator.
Screen fish capacity from water volume, a user-selected target biomass density and intended harvest weight.
Fish stocking density inputs
Planning tool only. Monitor water quality and animal behaviour, validate species-specific limits and follow the direction of a qualified aquaculture professional before changing stocking, feed, aeration or water chemistry.
Method: Target biomass equals water volume in cubic metres multiplied by the density you enter. Fish count divides this biomass by the intended harvest weight per fish.
Inputs used: Available water volume = 20,000 L; Your target harvest biomass density = 20 kg/m³; Target harvest weight = 500 g/fish
Assumptions: The result uses the values, units and options shown in the input snapshot.
Scope and warnings: Planning tool only. Monitor water quality and animal behaviour, validate species-specific limits and follow the direction of a qualified aquaculture professional before changing stocking, feed, aeration or water chemistry. Rounding and excluded real-world terms can make an external result differ.
How this fish stocking density calculator works
Target biomass equals water volume in cubic metres multiplied by the density you enter. Fish count divides this biomass by the intended harvest weight per fish.
A worked example
At 20 kg/m³, a 20 m³ tank targets 400 kg of harvest biomass; at 500 g per fish, that is 800 fish.
Does it prescribe a safe density for every species?
No. Stocking depends on species, life stage, tank management, oxygen, solids removal, biosecurity and local expertise. Enter a documented farm target.
Calculations run on your device. Review your results before exporting or sharing them.
Work from planned harvest biomass
Water volume is converted into a target biomass using the density you choose, then into fish count at the intended harvest weight. This keeps a capacity target separate from a stocking prescription.
A density that works in one farm may fail in another. Species, juvenile size, oxygen transfer, solids handling, health, weather and emergency backup all need to be assessed together.
Published by ToolMitra — methods and editorial approach.