Salmon Sea Lice Advanced Treatment: Integrated Pest Management

Integrated pest management for sea lice in salmon farming combines biological, physical, and chemical controls to reduce lice burden while minimizing treatment-related welfare harms.

Key Facts

Sea lice infestation costs the global salmon industry over 1 billion USD annually in treatment and production losses
Caligus and Lepeophtheirus species cause skin lesions, secondary infection, and chronic pain in affected salmon
Cleaner fish — wrasse and lumpfish — remove lice biologically, reducing chemical treatment frequency
Thermolicer and Hydrolicer systems use brief warm water or pressure exposure to detach lice without chemicals
Emamectin benzoate resistance is spreading, limiting chemical treatment efficacy and driving IPM adoption
Closed containment and semi-submersible systems physically prevent lice attachment at the larval stage

Welfare Considerations

Sea lice welfare harm is dual — the lice infestation itself causes pain and stress, while some treatment methods (particularly hydrogen peroxide bath treatments and thermolicer) cause significant acute welfare harms to salmon if improperly applied. IPM approaches are superior to single-tool reliance because they minimize both lice burden and treatment stress. Cleaner fish welfare is an additional consideration — wrasse and lumpfish used in biological control have their own welfare needs including appropriate habitat and feed.

What You Can Do

Purchase salmon from farms with documented integrated pest management programs
Support research into cleaner fish welfare standards as biological control use expands
Advocate for phasing out hydrogen peroxide treatments with inadequate post-treatment mortality monitoring
Choose ASC-certified salmon which requires lice monitoring and management plan documentation