What is the maximum stocking density for tilapia?

Tilapia can be stocked at up to 50 kg/$\text{m}^{3}$ in well-aerated recirculating systems. However, densities above 35 kg/$\text{m}^{3}$ (70% of max) require excellent water quality management and supplemental aeration.

What is the maximum stocking density for salmon?

Atlantic salmon are typically stocked at a maximum of 25 kg/$\text{m}^{3}$. Welfare guidelines in many jurisdictions recommend staying below 20 kg/$\text{m}^{3}$.

How does stocking density affect fish health?

Overstocking leads to oxygen depletion, ammonia buildup, increased disease transmission, fin damage from crowding, chronic stress, and poor FCR. It is one of the most common causes of production loss.

How do I convert between units?

Stocking density is expressed as kg/$\text{m}^{3}$. To calculate: Biomass (kg) = (Number of Fish x Average Weight in grams) / 1000. Volume ($\text{m}^{3}$) = Tank Volume in Liters / 1000.

ToolsConductScience tool

AquacultureFree in-browser calculator

Stocking Density Checker.

Check if your tank stocking density is within safe limits for tilapia or salmon. Species-specific biomass risk assessment.

Run calculator Request a Quote

PrivateData stays in your browser

LiveNo sign-up required

Validated2026-04-08

CitableMethods and citation included

Calculator

Results update in place

Try it out

Load example stocking checker data to see the full workflow

Tank & Fish Parameters

Species

Tank Volume (L)

Number of Fish

Avg Weight (g)

Results

safe2.0 kg/m³

Stocking density 2.0 kg/m³ is well within limits for tilapia.

Density

2.0 kg/m³

current

Max Density

50 kg/m³

for tilapia

Biomass

20.0 kg

total

Volume

10.0 m³

tank

When to use

Before stocking new fish to plan appropriate numbers
After sampling to check if growth has pushed density too high
When designing new tanks or ponds for target production
During regulatory compliance checks

Do not use for

Without accounting for growth — recalculate as fish grow
For species not listed — maximum densities vary by species

Density increases as fish grow

Even with no new fish added, biomass density rises as fish gain weight. Recalculate monthly after sampling.

Aeration determines practical limits

Maximum stocking density assumes adequate aeration and water treatment. Poor aeration means lower safe densities.

Consider welfare, not just survival

Fish can survive at maximum density but may not thrive. Aim for 70% or less of maximum for best FCR and welfare.

Method

Maximum stocking densities from FAO guidelines and RSPCA welfare standards. Risk tiers: safe (≤70% max), caution (70–100% max), danger (>100% max).

Validated

Last validated 2026-04-08. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

ConductScience Aquaculture Stocking Density Checker (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/aquaculture-stocking-density-checker

FAO. Aquaculture Development: Good Aquaculture Practices. FAO Technical Guidelines. 2012.

RSPCA. Welfare Standards for Farmed Atlantic Salmon. 2021.

Stocking Density in Aquaculture

Stocking density — the biomass of fish per unit volume of water — is a key determinant of production success and animal welfare. Each species has a maximum density beyond which water quality deteriorates faster than the system can compensate. This tool calculates current density and compares it to species-specific maximum thresholds, helping operators maintain safe and productive conditions.

Frequently asked

325

Free tools

1,200+

Institutions

100%

Client-side

Uploads required

Next steps

Equipment