Influence of temperature on Streptococcus agalactiae infection in Nile tilapia

  • Paulo Fernandes Marcusso Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Patologia Animal
  • Jefferson Yunis Aguinaga Universidade Estadual Paulista “Júlio de Mesquita Filho”, Centro de Aquicultura
  • Gustavo da Silva Claudiano Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Patologia Animal
  • Silas Fernandes Eto Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Patologia Animal
  • Dayanne Carla Fernandes Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Patologia Animal
  • Hurzana Mello Universidade Estadual Paulista “Júlio de Mesquita Filho”, Centro de Aquicultura
  • Fausto de Almeida Marinho Neto Universidade do Norte do Paraná
  • Rogério Salvador Universidade do Norte do Paraná
  • Julieta Rodini Engrárcia de Moraes Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Patologia Animal
  • Flávio Ruas de Moraes Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Patologia Animal
Keywords: Homeostasis, Oreochromis niloticus, Teleost, Thermal stress

Abstract

Environmental changes affect fish homeostasis, turning them more susceptible to diseases. In Brazil, outbreaks of Streptococcus agalactiae infection have been reported in Nile tilapia when they are outside of their thermal comfort zone. This investigation evaluated mortality rate and which were the most infected organs at temperatures that naturally occurred in southern of Brazil. Forty Nile tilapia (Oreochromis niloticus) were infected with S. agalactiae and distributed in four groups (n=10) and each group was exposed to a different temperature: G1: 24°C, G2: 26°C, G3: 28°C, and G4: 32°C. Fish were monitored for 10 days. In this period, fish that presented irreversible clinical signs were sacrificed and samples of brain, liver, and kidney were collected for bacteriological and molecular analysis. Signs compatible with a streptococcal infection were observed in all groups. Highest mortality rates occurred at 24°C and 32°C. The brain was the most affected organ with the highest percentage of isolation of S. agalactiae by both methods of diagnosis. The results suggest that, as in mammals, temperatures that are further away from the comfort zone influence fish homeostasis, increasing susceptibility to bacterial infections.

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Published
2015-04-13
How to Cite
Marcusso, P., Aguinaga, J., Claudiano, G., Eto, S., Fernandes, D., Mello, H., Marinho Neto, F., Salvador, R., Moraes, J., & Moraes, F. (2015). Influence of temperature on Streptococcus agalactiae infection in Nile tilapia. Brazilian Journal of Veterinary Research and Animal Science, 52(1), 57-62. https://doi.org/10.11606/issn.1678-4456.v52i1p57-62
Section
ARTICLES