Fish

Salmon Lice and Farmed Salmon Welfare

Sea lice infestations are the most significant welfare problem in farmed Atlantic salmon. Understanding the scale of this problem drives improvements in aquaculture practices.

Key Facts

Sea lice attach to salmon skin and feed on mucus, skin, and blood
A single farmed salmon can harbor dozens of lice causing significant tissue damage
Lice infestations spread from farms to wild salmon populations nearby
Treatments including chemical baths and mechanical removal cause additional stress
Louse-resistant breeding and cleaner fish like wrasse are emerging solutions

Welfare Considerations

Severe sea lice infestations cause open wounds, secondary infections, and chronic pain in farmed salmon. The stress of treatment procedures adds to the welfare burden — mechanical delousing involves handling and temperature changes that cause injury and mortality. Cleaner fish used as biological controls are themselves often welfare-compromised by conditions in salmon pens. Underwater LED lights and selective breeding programs offer more welfare-compatible solutions.

What You Can Do

Choose salmon from certified high-welfare producers with low lice reporting
Advocate for mandatory lice counting and public disclosure requirements
Support research into non-chemical lice management approaches
Reduce farmed salmon consumption until welfare standards improve
Oppose expansion of salmon farm licenses near wild salmon river systems