Overview
Streptococcus iniae infection is a significant pathogen affecting farmed tilapia, particularly impacting growth, immune function, and survival rates in juvenile fish 1.Diagnosis
Clinical signs include lethargy, loss of appetite, skin ulcers, and hemorrhagic septicemia 1.
Laboratory tests reveal decreased white blood cell count, elevated hematocrit, hemoglobin, and liver enzymes (AST, ALT) in deficient conditions 1.
Histopathological examination may show signs of liver stress and inflammatory response 1.Management
Supplementation with vitamin E can mitigate the severity of infection by enhancing immune response and antioxidant capacity 1.
No specific drug treatments for S. iniae infection in tilapia are mentioned in the provided abstracts.Special Populations
Juvenile Fish (Fingerlings): Vitamin E deficiency significantly impacts the health and susceptibility to S. iniae infection in juvenile tilapia, highlighting the importance of proper nutrition 1.Key Recommendations
Ensure adequate dietary vitamin E supplementation in juvenile tilapia diets to enhance immune function and reduce susceptibility to Streptococcus iniae infection (Evidence: Moderate 1).
Monitor hematological parameters (white blood cell count, hematocrit, hemoglobin, liver enzymes) in infected populations to assess disease severity and response to nutritional interventions (Evidence: Moderate 1).
Implement regular health checks and early detection strategies for clinical signs of S. iniae infection in farmed tilapia populations (Evidence: Expert opinion 1).References
1 Qiang J, Wasipe A, He J, Tao YF, Xu P, Bao JW et al.. Dietary vitamin E deficiency inhibits fat metabolism, antioxidant capacity, and immune regulation of inflammatory response in genetically improved farmed tilapia (GIFT, Oreochromis niloticus) fingerlings following Streptococcus iniae infection. Fish & shellfish immunology 2019. link