Farmed Shrimp Disease Welfare: White Spot Syndrome and Stress

White spot syndrome virus causes catastrophic shrimp farm losses and significant welfare harm. Prevention and rapid response protect both shrimp welfare and farm viability.

Key Facts

White spot syndrome virus (WSSV) has caused billions in losses to shrimp farming since the 1990s
WSSV kills up to 100% of infected ponds within 3-10 days of outbreak
Dying shrimp reduce feeding, turn white, and become lethargic before death
Biosecurity measures including pathogen-free seed and water treatment reduce outbreak risk
Mass culling of infected ponds — often using chlorine — is the standard disease response

Welfare Considerations

WSSV infection causes rapidly progressive disease that results in high mortality. The virus disrupts shrimp physiology, causing organ failure and behavioral changes before death. The scale of WSSV outbreaks — entire ponds dying within days — represents enormous welfare harm that is difficult to address through conventional means. Mass culling of infected ponds with chlorine kills remaining shrimp but ends an already fatal disease process. Prevention through biosecurity is both the most economically and welfare-positive approach. The extreme density of intensive shrimp ponds amplifies outbreak severity, making density reduction another welfare and disease prevention tool.

What You Can Do

Choose shrimp from farms with documented biosecurity and health management programs
Support research into WSSV vaccines and resistant shrimp genetics
Advocate for lower stocking densities that reduce disease outbreak severity
Reduce shrimp consumption from unregulated intensive production systems