Disease outbreaks in shrimp aquaculture cause mass mortality events and individual suffering at scales that are rarely discussed in welfare contexts, affecting hundreds of billions of individuals annually.
Shrimp disease creates welfare harms that are difficult to fully conceptualize at the scale of hundreds of billions of individuals. A WSSV outbreak that kills 50-80% of a pond stocking of millions of shrimp over days involves each animal experiencing progressive organ failure and behavioral deterioration before death. Whether this constitutes welfare-relevant suffering depends on the contested question of shrimp sentience, but the scale of potential harm under even low probability sentience assumptions is enormous. Disease prevention through biosecurity and reduced stocking density simultaneously addresses animal welfare concerns and production stability — aligned incentives that have not produced sufficient industry investment in prevention relative to reactive treatment. Welfare-centered disease management would prioritize conditions that minimize disease risk as a primary welfare obligation, not merely as a production efficiency concern.