Salmon Aquaculture Sea Lice Management

Sea lice infestations in Atlantic salmon farms cause significant welfare harms to both farmed fish and wild salmon, making lice management one of the central welfare challenges in the aquaculture industry.

Key Facts

Sea lice (Lepeophtheirus salmonis) cause skin lesions, secondary infections, and chronic stress in affected fish
Chemical treatments used against sea lice have raised resistance and environmental concerns
Biological control using cleaner fish such as wrasse and lumpfish is a growing alternative
Laser systems that target individual sea lice are an emerging non-chemical treatment
High sea lice burdens have been correlated with increased cortisol in farmed salmon

Welfare Considerations

Sea lice management sits at the intersection of farmed fish welfare, wild fish welfare, and environmental protection. Infested farmed salmon experience chronic pain from lesions and secondary infections, while sea lice escaping into surrounding waters parasitize wild juvenile salmon. Non-chemical approaches including cleaner fish, laser systems, and thermal treatment address the welfare of farmed fish while reducing environmental impacts on wild populations. The industry's welfare trajectory depends substantially on lice management innovation.

What You Can Do

Choose farmed salmon certified under schemes with sea lice management and monitoring standards
Support research into non-chemical sea lice management approaches for aquaculture
Advocate for mandatory sea lice reporting and maximum burden thresholds in aquaculture regulation
Learn about sea lice ecology and its impacts on both farmed and wild salmon welfare