Influência da temperatura na infecção de tilápias do nilo por streptococcus agalactiae

Translated title of the contribution: Influence of temperature on streptococcus agalactiae infection in nile tilapia

Paulo Fernandes Marcusso, Jefferson Yunis Aguinaga, Gustavo Da Silva Claudiano, Silas Fernandes Eto, Dayanne Carla Fernandes, Hurzana Mello, Fausto De Almeida Marinho Neto, Rogério Salvador, Julieta Rodini De Engrácia Moraes, Flávio Ruas De Moraes

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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.

Translated title of the contributionInfluence of temperature on streptococcus agalactiae infection in nile tilapia
Original languagePortuguese
Pages (from-to)57-62
Number of pages6
JournalBrazilian Journal of Veterinary Research and Animal Science
Issue number1
StatePublished - 2015


  • Homeostasis
  • Oreochromis niloticus
  • Teleost
  • Thermal stress


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