Aquaculture Welfare

Farmed Tilapia Streptococcosis Welfare

Streptococcal disease is the most significant welfare and production challenge in global tilapia farming - vaccination and biosecurity are the most effective responses.

Key Facts

Streptococcus agalactiae and S. iniae cause haemorrhagic disease in tilapia globally
Clinical signs include exophthalmia (pop-eye), erratic swimming, and haemorrhagic lesions
Mortality can reach 50%+ in acute outbreaks without intervention
Commercial vaccines against S. agalactiae are available and effective
Probiotic supplementation reduces Streptococcus burden in farm environments

Welfare Considerations

Streptococcal disease causes visible, prolonged suffering in affected tilapia - abnormal swimming, haemorrhage, and neurological signs indicate real welfare compromise. Prevention through vaccination is both more effective and more ethical than antibiotic treatment.

What You Can Do

Support aquaculture certification schemes that require vaccination against streptococcosis
Advocate for antibiotic stewardship in tilapia farming to reduce resistance development
Choose tilapia from certified farms with published disease management and vaccination protocols