Aquaculture Welfare

Farmed Salmon Sea Lice Resistance

Growing resistance to sea lice treatments in farmed salmon creates welfare challenges as effective treatment options narrow and lice burdens cause increasing chronic stress and injury.

Key Facts

Lepeophtheirus salmonis has developed resistance to most licensed chemical treatments
Treatment frequency increases as efficacy declines, adding treatment stress to welfare burden
Biological controls using cleaner fish have welfare implications of their own
Genetic resistance breeding programs offer a long-term tool alongside management interventions
Fallowing and site management remain key components of lice management

Welfare Considerations

Sea lice resistance to treatments creates an escalating welfare problem where ineffective treatments cause treatment stress while leaving chronic parasite burden unaddressed. Addressing resistance requires investment in both sustainable management systems and genuinely new treatment approaches.

What You Can Do

Support research into sea lice resistance and alternative management approaches
Choose salmon from farms with effective lice management programs
Learn about the welfare implications of sea lice infestation and treatment in salmon farming