Aquaculture

Farmed Salmon Sea Lice Treatment Welfare

Sea lice treatments in farmed salmon cause significant acute welfare harm and their frequency indicates a failure of preventive management.

Key Facts

Bath treatments immerse salmon in hydrogen peroxide or chemical solutions
Crowding before treatment and temperature shock during baths cause acute stress
Mechanical treatments including Hydrolicer create physical trauma in some fish
Treatment mortality can reach 1-2% in some operations
Lice resistance to treatments is increasing, requiring more frequent or intense interventions

Welfare Considerations

Sea lice treatments cause acute welfare harm through crowding stress, chemical exposure, and handling. The welfare imperative is to reduce the need for treatment through prevention - biosecurity, genetics, cleaner fish, and fallowing - rather than treating as the primary management tool. Treatment frequency should be a welfare audit indicator.

What You Can Do

Support aquaculture certification requiring treatment frequency monitoring
Advocate for preventive management standards reducing treatment need
Choose salmon from producers with low documented treatment rates