Aquaculture Disease Management and Welfare

Disease outbreaks in farmed fish cause massive mortality and prolonged suffering. Improving disease management is one of the most impactful ways to advance aquaculture welfare.

Key Facts

Disease is estimated to cause 10-20% losses in global aquaculture production annually
Bacterial, viral, and parasitic diseases cause significant suffering before mortality
Crowded conditions in fish farms promote disease transmission among individuals
Antibiotics are widely used in aquaculture, raising welfare and food safety concerns
Vaccines have reduced antibiotic use substantially in Norwegian salmon farming
Biosecurity measures including water treatment and disinfection reduce outbreak frequency

Welfare Considerations

Fish disease outbreaks represent enormous welfare burdens, with millions of animals suffering from bacterial infections, viral diseases, and parasitic infestations over days to weeks before death. High stocking densities that drive disease transmission create a fundamental tension between economic efficiency and welfare. Prevention-focused approaches including vaccination, improved biosecurity, genetic selection for disease resistance, and density management reduce disease burden more effectively than treatment. When disease occurs, rapid detection and humane emergency slaughter can reduce prolonged suffering. Moving away from antibiotic dependence requires investment in alternative preventive strategies.

What You Can Do

Support aquaculture certification schemes that require disease monitoring and biosecurity plans
Advocate for regulations limiting stocking densities to reduce disease pressure
Support research into fish vaccines and disease-resistant genetics
Choose fish products from farms with strong biosecurity and low antibiotic use records