Aquatic Animal Welfare

Aquaculture Stocking Density and Crowding Welfare

Stocking density in aquaculture directly affects fish welfare through oxygen availability, disease risk, stress and aggressive interaction frequency.

Key Facts

Maximum stocking densities for salmon are regulated at 20-25 kg/m3 in some jurisdictions
Higher densities increase cortisol, fin damage and respiratory workload
Lower stocking densities improve growth efficiency and reduce disease incidence
The optimum density balances welfare and production economics
Behavioural indicators of crowding stress include surface orientation and reduced feeding

Welfare Considerations

Stocking density is one of the most significant modifiable factors affecting farmed fish welfare. Evidence consistently shows welfare benefits from lower densities. Certification schemes that require densities below maximum legal limits provide additional welfare protection.

What You Can Do

Choose certified farmed fish from operations with below-maximum stocking density standards
Advocate for evidence-based stocking density limits in aquaculture regulations
Support research into welfare-optimal stocking densities across farmed fish species