Farmed Shrimp Disease Welfare: Early Mortality Syndrome and Biosecurity

Disease outbreaks in farmed shrimp, particularly Early Mortality Syndrome (EMS), kill billions of shrimp and represent a major welfare and industry crisis. Prevention through biosecurity is more effective than treatment.

Key Facts

Early Mortality Syndrome (EMS/AHPND) caused by Vibrio parahaemolyticus has devastated shrimp farms across Asia since 2010
EMS causes rapid liver and pancreatic failure with mortality rates approaching 100% within the first 30 days
White Spot Syndrome Virus (WSSV) and Infectious Myonecrosis Virus are among the most significant viral threats to shrimp welfare
Biosecurity measures including water treatment, screening of seed stock, and preventing wild shrimp access significantly reduce disease risk
Probiotic supplementation with Bacillus species shows promise for reducing bacterial pathogen loads in farm systems
Specific Pathogen Free (SPF) broodstock programs reduce the introduction of major pathogens through seed
The welfare impact of mass shrimp mortality events is enormous in scale but the welfare interpretation depends on the uncertain moral status of shrimp

Welfare Considerations

Farmed shrimp disease welfare intersects with the philosophical uncertainty about shrimp moral status. If shrimp can suffer - and the 2021 UK recognition of decapod crustacean sentience suggests they probably can to some degree - then mass mortality events from EMS and viral disease represent enormous welfare harm alongside the economic losses. The disease management imperative is thus simultaneously a welfare imperative and a production imperative, making biosecurity investment a shared-interest area. Prevention through SPF broodstock, biosecurity management, and water quality control reduces both welfare harm and economic loss. The welfare monitoring question for shrimp disease is not only how many animals die but what the experience of the dying is - improving the evidence base for this shapes what welfare-positive disease management means in practice.

What You Can Do

Support shrimp certification schemes that include disease management and biosecurity standards as welfare criteria
Advocate for shrimp disease monitoring to be required reporting in major producing countries
Support research into less stressful biosecurity measures that reduce pathogen exposure without additional welfare costs
Choose shrimp from operations with documented SPF broodstock programs and active disease monitoring
Reduce shrimp consumption during outbreak periods in key producing regions where welfare impacts are severe