Aquaculture

Farmed Salmon Lice Chemical Treatment Welfare

Chemical treatments for sea lice in farmed salmon cause acute welfare impacts requiring management to minimise harm.

Key Facts

Bath treatments using hydrogen peroxide or azamethiphos cause gill irritation and stress
Treatment mortality can occur in vulnerable fish including those already stressed by crowding
Treatment frequency must balance lice welfare harm against fish host welfare harm
In-feed treatments avoid bath treatment stress but have resistance and environmental concerns

Welfare Considerations

Sea lice chemical treatments cause acute welfare stress through handling, crowding, and chemical irritation. Treatment mortality occurs particularly in already-compromised fish. Minimising treatment frequency through resistant genetics, cleaner fish, and mechanical alternatives reduces treatment welfare costs while maintaining lice control.

What You Can Do

Support aquaculture research into non-chemical sea lice management
Choose salmon with transparent welfare reporting including treatment protocols
Advocate for treatment welfare standards in aquaculture certification schemes