Aquaculture

Farmed Salmon Lice Resistance Management

Sea lice resistance to pharmaceutical treatments is a growing crisis in salmon aquaculture, with welfare implications as effective treatments diminish.

Key Facts

Caligus and Lepeophtheirus species have developed resistance to multiple chemical treatments
Resistance limits treatment options and increases lice burden on affected fish
High lice burdens cause tissue damage, blood loss, and behavioral disturbance
Integrated pest management combining biological control, mechanical treatment, and chemicals reduces resistance pressure
Cleaner fish including lumpfish and wrasse provide non-chemical lice reduction

Welfare Considerations

Salmon with high lice burdens experience chronic tissue damage and blood loss equivalent to a persistent wound. Treatment failures due to resistance allow welfare compromise to persist and worsen.

What You Can Do

Support salmon from farms with documented integrated lice management programs
Advocate for regulatory frameworks that incentivize lice management strategies that minimize resistance
Choose salmon certified by schemes that set lice burden limits and treatment protocols