Farmed Shrimp Disease Welfare: White Spot, EMS and Mortality Challenges

Disease outbreaks cause mass mortality and significant welfare compromise in farmed shrimp. Understanding major diseases and prevention strategies is central to improving shrimp aquaculture welfare.

Key Facts

White spot syndrome virus is the most devastating disease of farmed shrimp, causing mortality rates of up to 100 per cent
Early mortality syndrome causes rapid and high mortality in juvenile shrimp populations in affected ponds
Disease outbreaks result in welfare compromise through acute physiological stress and mass mortality events
Intensive shrimp culture with high stocking densities creates conditions conducive to rapid disease spread
Biosecure, pathogen-free hatchery production of specific-pathogen-free shrimp post-larvae reduces disease introduction
Probiotics and immunostimulants are increasingly used to enhance shrimp disease resistance in commercial culture
Indoor recirculating systems offer superior disease control compared to open pond culture but at higher cost

Welfare Considerations

Disease outbreaks in shrimp aquaculture cause welfare impacts that are particularly difficult to address given the scale of operations and the challenges of treating vast numbers of small animals. The mass mortality events associated with major shrimp diseases cause acute stress in affected populations before death. Prevention through biosecurity measures, high-health stock selection, water quality management, and reduced stocking densities is more welfare-appropriate than attempting to treat established disease outbreaks. The shift toward specific-pathogen-free post-larvae and improved biosecure production systems represents genuine progress for both welfare and productivity. Understanding disease welfare in shrimp requires acknowledgment of the likely capacity for some form of suffering in these animals, driving investment in prevention as a welfare priority.

What You Can Do

Choose certified farmed shrimp from operations with documented disease prevention and biosecurity programmes
Support aquaculture certification standards that include disease management welfare criteria
Learn about the connection between stocking density, water quality, and disease risk in shrimp farming
Advocate for industry investment in closed-containment systems that reduce disease risk and welfare compromise
Support research into immune-enhancing approaches that reduce disease without antibiotic dependency