Copacol Cooperative - Tilapia Slaughter - Photo: Jonathan Campos / AEN / parana.pr.gov.br

New Diseases Threaten Brazil's Tilapia Farming

BRAZIL
Thursday, September 04, 2025, 17:00 (GMT + 9)

Emerging Pathogens Highlight Need for Enhanced Biosecurity and Rapid Diagnosis in Aquaculture

BRAZIL—The country's thriving tilapia industry is facing a growing challenge from new and emerging diseases that are causing significant mortality and financial losses. According to an article from O Presente Rural, this issue requires a renewed focus on preventive management, biosecurity, and rapid diagnosis to ensure the sustainability of fish farming.

Three key pathogens have been identified as major threats:

• Iridovirus ISKNV: A virus that, while previously unknown in Brazil, has now been reported and can have a devastating impact on fish health, particularly during periods of falling water temperatures.

• Edwardsiella anguillarum: Another bacterium that thrives in cooler conditions and affects juvenile tilapia.

• Lactococcus petauri: A new bacterial pathogen, never before reported in tilapia farming outside of Brazil, that primarily affects fish during seasonal transitions from summer to fall and winter to spring.

According to Santiago Benites de Pádua, a veterinarian and aquaculture expert, the financial impact of these diseases is substantial, with more than 80% of mortality occurring in the early stages of rearing. While this early loss is significant, mortality during the growth and fattening phases can be even more economically damaging, as producers lose fish that are close to market weight and have already accumulated high production costs.

Importance of Diagnosis and Prevention

Rapid diagnosis is crucial for containing outbreaks. Pádua stresses that while field examinations by health professionals are a good first step, a definitive diagnosis requires laboratory analysis. This allows for the precise identification of the causative agent and informs the use of appropriate treatments, such as antibiotics.

To minimize these losses, the aquaculture industry must implement strong biosecurity protocols. The most effective strategies include:

• Sourcing high-quality fingerlings and juveniles from reputable suppliers with established health programs.

• Utilizing a vertically integrated production system to maintain better control over the entire farming cycle.

• Maintaining strict control over the introduction of fish from other countries to prevent the spread of exotic pathogens.

Pádua will share his insights and recommendations on these emerging diseases and control measures at the 7th International Fish Congress & Fish Expo Brasil (IFC Brasil). The event, held from September 2nd to 4th at the Maestra Grand Convention Center Recanto das Cataratas Thermas & Resort in Foz do Iguaçu (PR), brings together government, industry leaders, and researchers to address the future of the Brazilian fishing market. This platform provides a crucial opportunity to discuss and implement strategies to protect the country's valuable tilapia production.

editorial@seafood.media
www.seafood.media

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