Aquaculture

Farmed Salmon Lice-Resistant Genetics Welfare

Genetic selection for sea lice resistance in Atlantic salmon offers a welfare improvement that reduces treatment burden and direct parasite-caused suffering.

Key Facts

Sea lice (Lepeophtheirus salmonis) cause skin damage, stress, and mortality in salmon
Genetic variation in lice resistance within Atlantic salmon is heritable
Breeding programmes in Norway have demonstrated meaningful genetic progress in lice resistance
Lice-resistant salmon require fewer treatment interventions, reducing treatment-related welfare impacts
Resistance genetics complement biological control through cleaner fish

Welfare Considerations

Sea lice cause direct suffering through skin lesions and stress responses. The welfare benefit of genetic lice resistance operates through two pathways: reduced direct parasite burden and fewer stressful treatment interventions. Combining resistant genetics with biological control methods provides the strongest welfare protection.

What You Can Do

Support aquaculture certifications that include genetics as a welfare factor
Choose salmon from companies investing in welfare-focused breeding programmes
Advocate for welfare genetics research funding in aquaculture industry bodies