Disease outbreaks are the primary cause of shrimp mortality in aquaculture, causing significant production losses and raising welfare questions about how farmed shrimp experience disease states and treatment stress.
Shrimp disease welfare sits at the intersection of production economics and precautionary animal welfare principles. Disease outbreaks — which kill billions of shrimp annually — cause mass mortality events whose welfare significance depends on the still-unresolved question of shrimp sentience. However, behavioral evidence suggests sick shrimp experience physiological distress — reduced feeding, aberrant movement patterns, and immune dysfunction are observable even if subjective suffering cannot be confirmed. Chemical treatments used to control pathogens — antibiotic application, pond disinfection with chlorine or potassium permanganate — likely cause additional stress responses. Biosecure production systems that reduce disease incidence through SPF broodstock, improved water quality, and lower stocking densities simultaneously address production losses and potential welfare costs. The precautionary argument applies: if we cannot rule out that shrimp experience distress during disease, then reducing disease incidence through welfare-compatible biosecurity measures is both economically and ethically sound.