Aquatic Animals

Overcrowding in Fish Farms and Welfare Impacts

High stocking densities in fish farms cause aggression, disease, and chronic stress, significantly compromising fish welfare at scale.

Key Facts

Salmon farms can hold up to 50,000 fish per cage
High densities increase aggressive fin-nipping and injury rates
Sea lice infestations are linked to crowded conditions
Mortality rates of 10-20% are common in some salmon farms

Welfare Considerations

Crowded conditions in fish farms prevent normal social behavior, increase disease transmission, and elevate chronic stress hormones that impair immune function. Fish at high densities show altered brain chemistry consistent with anxiety and depression in mammals. Welfare-focused aquaculture uses lower densities and environmental enrichment.

What You Can Do

Choose fish certified by welfare-focused aquaculture standards
Support research into fish welfare indicators
Advocate for binding stocking density limits in aquaculture
Reduce salmon and trout consumption from intensive farms