Aquatic Animals

Farmed Salmon Crowding and Density Welfare

Stocking density is the primary modifiable driver of welfare outcomes in salmon farms, with crowding causing chronic stress, injury, and disease.

Key Facts

Norwegian regulations permit stocking densities up to 25 kg per cubic meter in salmon farms
At high densities aggressive interactions, fin damage, and feeding competition intensify significantly
Higher-welfare certification schemes typically require maximum densities of 15-20 kg per cubic meter
Research shows cortisol and injury rates increase sharply above 20 kg per cubic meter

Welfare Considerations

Crowding represents the most tractable welfare challenge in salmon farming because density is directly controlled by producers. The economic pressure to maximize stocking density conflicts directly with welfare outcomes. Consumer demand for lower-density certified salmon, combined with regulatory standards, creates the market signal needed to drive industry-wide improvement.

What You Can Do

Choose salmon products certified to lower stocking density standards
Advocate for regulatory maximum stocking density limits that protect welfare
Support retailers in transitioning their salmon sourcing to lower-density certified farms
Urge aquaculture industry bodies to adopt density limits as industry-wide standards
Support research quantifying the welfare benefits of different density reductions