Aquaculture Disease Prevention Welfare

Disease prevention in aquaculture through biosecurity, vaccination, and management improves animal welfare while reducing the need for therapeutic antibiotic treatment.

Key Facts

Infectious salmon anaemia, bacterial kidney disease, and sea lice are major welfare-affecting diseases in salmon farming
Vaccination has reduced antibiotic use in Norwegian salmon farming by over 97% since the 1990s
Biosecurity measures including fallowing, site selection, and equipment disinfection reduce disease transmission
Selective breeding for disease resistance improves welfare outcomes in commercially farmed species
Biomass monitoring enables early disease detection before clinical signs become widespread

Welfare Considerations

Disease prevention welfare in aquaculture mirrors the livestock welfare principle that prevention is superior to treatment both for animals and economics. Disease imposes direct welfare costs — immune responses cause fever, lethargy, and pain; severe disease causes protracted suffering and death. Prevention through vaccination, biosecurity, and selective breeding for resistance reduces disease prevalence and therefore aggregate suffering across entire production cycles. The Norwegian salmon industry's success in reducing antibiotic use by over 97% through vaccination demonstrates that disease prevention at scale is achievable. As welfare-motivated disease prevention reduces antibiotic use, it simultaneously addresses the antimicrobial resistance challenge — another case where welfare and public health goals align.

What You Can Do

Choose farmed fish from certified producers with transparent disease management data
Support aquaculture certifications that require vaccination programmes where available
Advocate for biosecurity standards including site fallowing in aquaculture regulation
Follow fish disease welfare research through Cefas and IMR publications