Aquaculture Welfare

Farmed Salmon Lice Resistance Advanced 2026

Sea lice resistance to multiple treatments is a growing welfare crisis in salmon farming - resistance management requires coordinated industry action.

Key Facts

Resistance to hydrogen peroxide, azamethiphos, and deltamethrin is documented globally
Area management agreements that synchronise treatment and fallowing slow resistance development
Biological control using wrasse cleaner fish is growing as treatments lose efficacy
Genetic characterisation of resistant lice populations informs treatment rotation strategies
Sentinel fish programmes monitor treatment efficacy before fleet-wide treatment decisions

Welfare Considerations

Treatment-resistant sea lice result in higher parasite burdens, more frequent treatments, and increased welfare cost to salmon. Resistance management is simultaneously a welfare priority and an economic necessity for the industry.

What You Can Do

Support certification schemes that require area management agreements for lice control
Advocate for coordinated treatment rotation protocols to slow resistance development
Choose salmon from farms with published lice monitoring and treatment records