Farmed Salmon Welfare and Sea Lice

Salmon aquaculture is a growing industry with significant welfare challenges including sea lice infestations, crowding, and treatment procedures that cause suffering.

Key Facts

Global salmon aquaculture produces over 2.7 million tonnes annually
Sea lice are parasitic copepods that feed on salmon skin, scales, and mucus
Severe infestations cause open wounds, stress, and mortality
Treatment methods include bath treatments, laser systems, and biological controls
Crowding densities in net pens can exceed 15-25 kg per cubic meter of water
Salmon are anadromous fish with strong behavioral drives to migrate

Welfare Considerations

Sea lice infestations cause progressive tissue damage that exposed fish experience as chronic pain and stress. Lesions can penetrate to bone and cartilage in severe cases. Treatment methods including hydrogen peroxide baths expose fish to chemical irritants that cause acute distress. Crowded net pen conditions restrict natural swimming space, increase disease transmission, and prevent natural migratory behavior in animals with strong genetic programming for long-distance movement.

What You Can Do

Choose land-based recirculating aquaculture salmon over net-pen farmed salmon when possible
Look for certified standards like Best Aquaculture Practices that include welfare criteria
Advocate for maximum stocking density regulations in salmon aquaculture
Support research into non-chemical sea lice control methods
Reduce salmon consumption or choose wild-caught from certified sustainable sources
Contact supermarkets to request higher welfare standards from their salmon suppliers