Aquaculture

Farmed Salmon Delousing Treatment Welfare

Sea lice treatment methods in salmon farming range from mechanical to chemical, each with specific welfare implications requiring careful evaluation.

Key Facts

Thermolicer (hot water treatment) kills lice but can cause thermal burns at incorrect temperatures
Hydrogen peroxide bath treatment causes respiratory stress in salmon
Azamethiphos and deltamethrin bath treatments are effective but have environmental impacts
Mechanical brushing (hydrolicer) causes physical stress and fin damage
Cleaner fish deployment reduces treatment frequency but has its own welfare challenges

Welfare Considerations

All current sea lice treatment methods impose welfare costs on salmon. Treatment is necessary to prevent the greater welfare harm of heavy lice infestation, but optimising treatment timing, method, and water parameters minimises welfare burden.

What You Can Do

Support aquaculture welfare standards requiring treatment welfare monitoring
Advocate for investment in lice treatment methods with lower welfare impacts
Choose salmon from producers with documented treatment welfare protocols
Encourage research into less invasive sea lice management approaches