Aquatic Animal Welfare

Aquaculture and Salmon Lice Management

Sea lice are parasitic copepods that infest farmed Atlantic salmon, causing skin lesions, stress, and mortality. Treatment methods themselves can cause significant welfare harm.

Key Facts

Sea lice cost the salmon farming industry over billion annually worldwide
Heavy louse burdens cause open skin lesions, fin erosion, and anemia
Chemical treatments including organophosphates have significant welfare and environmental effects
Thermal delousing using hot water is effective but stressful and can cause injury
Biological controls using cleaner fish like wrasse raise their own welfare questions

Welfare Considerations

Sea lice management involves genuine welfare tradeoffs. Infestation causes chronic pain and immune stress. Chemical treatments reduce louse burden but expose fish to toxic compounds. Thermal and mechanical delousing cause acute stress and injury. Wrasse used as cleaner fish face welfare challenges in net pen environments. Land-based recirculating aquaculture systems eliminate lice entirely at much higher cost.

What You Can Do

Choose farmed salmon from land-based or closed-containment systems when available
Look for ASC-certified salmon that includes integrated pest management requirements
Support research into lice-resistant salmon genetics and welfare-compatible biologicals
Advocate for welfare standards that address all phases of the lice management cycle