Aquaculture Welfare

Farmed Salmon Lice Treatment Welfare Impacts

Sea lice treatments in salmon farming impose welfare costs on fish through thermal, chemical, and mechanical stresses.

Key Facts

Warm water bath treatments using 34 degrees Celsius cause heat stress and eye damage
Hydrogen peroxide bath treatments cause gill irritation and stress
Mechanical sea lice removal uses high-pressure water or laser systems
Multiple treatments are often required during a production cycle
Treatment stress can suppress immunity and predispose to disease

Welfare Considerations

Sea lice treatments impose significant acute welfare costs on farmed salmon. Thermal treatments cause eye damage and heat stress; chemical treatments cause gill irritation; mechanical treatments cause physical stress. The cumulative welfare burden of repeated treatments over a production cycle is substantial. Reducing lice numbers through better monitoring and biological control reduces the need for stressful treatments.

What You Can Do

Support investment in lice biological control to reduce treatment need
Advocate for welfare assessment of treatment protocols in aquaculture standards
Choose salmon from farms with low treatment frequency and transparent welfare data