Salmon Sea Lice Treatment Alternatives

Sea lice infestations cause significant welfare harm to farmed salmon. Reducing reliance on chemical treatments through biological and mechanical alternatives is a priority for industry and welfare advocates.

Key Facts

Sea lice cause open wounds, physiological stress, and mortality in farmed salmon
Cleaner fish including wrasse and lumpfish are used to eat lice off salmon
Wrasse welfare is a growing concern as millions are used annually with little welfare oversight
Mechanical treatments including warm water and laser systems cause acute stress
Chemical treatments including emamectin benzoate are increasingly linked to resistance
Prevention-focused approaches using deep lights and snorkel skirts reduce infestation rates

Welfare Considerations

Sea lice management involves multiple welfare trade-offs. Chemical treatments harm both target and non-target species, while mechanical treatments cause acute stress. Biological control using cleaner fish transfers welfare burdens to those fish, which have significant welfare needs of their own. Preventive approaches that reduce infestation rates in the first place offer the best welfare outcomes for all species involved.

What You Can Do

Choose salmon from farms with published sea lice management welfare policies
Support certification schemes requiring welfare standards for cleaner fish
Advocate for research funding into sea lice prevention methods
Reduce farmed salmon consumption to decrease demand for intensive aquaculture
Support organisations working on aquaculture welfare reform