Aquatic Animals

Salmon Farming Environmental Welfare Interactions

Open-net salmon farms affect wild fish welfare through sea lice transmission, escaped farmed fish, and nutrient loading that disrupts aquatic ecosystems.

Key Facts

Sea lice from salmon farms kill up to 40% of juvenile wild salmon passing farm sites in some studies
Farm-escaped Atlantic salmon interbreed with wild populations, reducing genetic fitness of offspring
Nutrient loading from salmon farm waste creates hypoxic zones that suffocate benthic organisms
Closed-containment land-based systems eliminate environmental impacts but are more expensive to operate

Welfare Considerations

Open-net salmon farming creates welfare harms that extend beyond the farm boundary to wild fish populations. Wild juvenile salmon that encounter farm-derived sea lice experience fatal infestations. Escaped farmed salmon that hybridize with wild fish produce offspring with lower survival rates. The cumulative welfare impact on wild fish populations is substantial and grows with industry expansion.

What You Can Do

Choose salmon from land-based closed-containment farms to avoid supporting open-net impacts
Advocate for transition timelines from open-net to closed-containment salmon farming
Support wild salmon recovery programs that address farming impacts
Urge seafood certification schemes to account for wild fish welfare impacts of open-net operations
Support research into the wild fish welfare impacts of different aquaculture systems