Welfare of Animals in Aquaculture Disease Management

Disease management in fish farming uses antibiotics, vaccines, and chemical treatments with varying welfare implications for farmed fish and surrounding ecosystems.

Key Facts

Norway reduced antibiotic use in salmon aquaculture by 99% between 1987 and 2010 through vaccination programs
Sea lice treatments in salmon farming include hydrogen peroxide baths, mechanical systems, and biological controls
Freshwater bathing treatments for sea lice cause significant stress but are less harmful than some chemicals
ISA (Infectious Salmon Anemia) outbreaks can require culling of entire farm populations
Vaccination of salmon before seawater transfer has eliminated most antibiotic use in Norwegian production

Welfare Considerations

Aquaculture disease management welfare involves tradeoffs: untreated disease causes chronic suffering in affected fish; treatment procedures (crowding, bathing, handling) cause acute stress. Vaccination programs are both the most welfare-positive disease control approach (prevention rather than treatment) and the most environmentally sustainable (eliminating antibiotic use). Mechanical sea lice removal — crowding fish into delousing vessels — causes significant short-term stress but avoids chemical welfare and environmental impacts.

What You Can Do

Choose salmon from producers using vaccination-based disease management without antibiotics
Support Norwegian model adoption of vaccination over antibiotic use in other fish farming nations
Donate to Aquatic Life Institute research on lower-welfare-impact fish disease management approaches
Advocate for disease management welfare standards in aquaculture certification schemes