Disease Management and Fish Welfare in Aquaculture

Disease is one of the most significant welfare challenges in aquaculture, with infections causing suffering and treatments sometimes adding welfare harms through stress and chemical exposure.

Key Facts

Disease accounts for 10-15% of global aquaculture production losses annually
Sea lice, infectious salmon anaemia, and amoebic gill disease are major welfare-relevant diseases in salmon farming
Vaccine development has dramatically reduced antibiotic use in Norwegian salmon farming over 30 years
Fish welfare is compromised during both disease episodes and many treatment procedures

Welfare Considerations

Aquaculture disease welfare involves a complex hierarchy of interventions. Prevention — through biosecurity, vaccination, and optimal environmental conditions — is most welfare-positive by eliminating disease before animals suffer. Early detection enables treatment before disease becomes severe. Treatment selection should prioritise methods with minimal welfare impact; chemical bath treatments cause acute handling stress and chemical exposure even when they eliminate parasites. Disease management systems that integrate prevention, monitoring, and minimally stressful treatment represent the welfare-optimal approach to aquaculture health management.

What You Can Do

Support vaccination as the primary disease prevention strategy in aquaculture
Advocate for biosecurity requirements that reduce disease introduction to fish farms
Choose certified aquaculture products from producers with documented disease management protocols
Support research into welfare-friendly disease detection and treatment methods for farmed fish