Farmed Animals

Salmon Net Pen Welfare: Sea Lice and Management

Sea lice infestations are the most significant welfare and economic problem in Atlantic salmon aquaculture, causing chronic stress and tissue damage.

Key Facts

Sea lice cost the global salmon aquaculture industry over $1 billion annually
Lice at high burdens cause erosion of skin, muscle damage, and secondary infections
Chemical treatments including hydrogen peroxide and azamethiphos are widely used
Biological control using cleaner fish (wrasse and lumpfish) is an expanding alternative
Closed containment systems eliminate sea lice but require higher capital investment

Welfare Considerations

Sea lice infestation causes significant chronic suffering in farmed salmon - the grazing behavior of lice on skin and flesh is painful, and heavy infestations compromise osmoregulation and immune function. Treatment methods themselves carry welfare costs including stress from handling and chemical exposure. Innovation toward lice-resistant closed systems represents the most welfare-positive direction.

What You Can Do

Choose salmon certified by schemes with sea lice welfare monitoring requirements
Support research and adoption of closed containment salmon aquaculture
Advocate for cleaner fish welfare standards - wrasse and lumpfish also suffer at high mortality rates
Reduce salmon consumption or choose plant-based omega-3 supplements instead