Disease outbreaks in farmed shrimp cause mass mortality and prolonged suffering, with prevention through biosecurity and water quality being the primary welfare strategy.
Shrimp disease management has welfare implications that go beyond productivity considerations. Mass mortality events from viral pandemics represent enormous numbers of animals dying from acute systemic disease — even if the welfare capacity of individual shrimp remains debated, the precautionary approach to reducing disease-induced suffering is appropriate. Chronic low-level disease, more difficult to detect than mass mortality, causes sustained immune compromise and physiological stress that represents ongoing welfare harm. The welfare case for biosecurity investment aligns with the commercial case: prevention is more effective than treatment, and disease-stressed ponds produce lower-quality product. As welfare science for crustaceans develops, disease prevention becomes an increasingly clear welfare priority. The shift from reactive treatment to proactive biosecurity represents welfare improvement at scale.