Aquaculture

Farmed Salmon Lice Resistance: Integrated Management Strategy

Sea lice resistance to multiple chemical treatments is threatening salmon welfare, requiring integrated management approaches.

Key Facts

Resistance to multiple acaricides including emamectin and deltamethrin is widespread in Norwegian salmon
Resistant lice cause greater welfare burden through higher lice loads despite treatment
Integrated management combining cleaner fish, mechanical removal, and chemicals reduces resistance development
Monitoring lice resistance on farms enables targeted treatment decisions

Welfare Considerations

Multi-resistant sea lice cause sustained welfare harm through skin damage, blood loss, and immune suppression. Preserving treatment efficacy through resistance management is both economically and welfare-critical. Integrated approaches reduce total treatment burden on both lice and salmon.

What You Can Do

Support aquaculture standards requiring integrated lice management including resistance monitoring
Advocate for mandatory resistance testing as part of certified salmon aquaculture
Choose salmon from farms publishing lice management and resistance monitoring data