Disease prevention in rainbow trout farming reduces suffering while improving production efficiency through shared welfare and economic incentives.
Trout disease prevention welfare demonstrates the alignment between animal welfare and production economics when both are measured across appropriate time horizons. Disease outbreaks cause mass mortality events that simultaneously harm millions of fish and impose enormous economic costs on producers. Prevention through vaccination, biosecurity, and genetic improvement serves both interests simultaneously. The historical success of trout vaccination programs in Scandinavia — dramatically reducing antibiotic use while maintaining production efficiency — provides a template for other aquaculture species and regions. Extending these successes globally requires investment in vaccine development, regulatory support for disease-resistant genetics, and international biosecurity cooperation.