TY - JOUR
T1 - Influência da temperatura na infecção de tilápias do nilo por streptococcus agalactiae
AU - Marcusso, Paulo Fernandes
AU - Aguinaga, Jefferson Yunis
AU - Da Silva Claudiano, Gustavo
AU - Eto, Silas Fernandes
AU - Fernandes, Dayanne Carla
AU - Mello, Hurzana
AU - De Almeida Marinho Neto, Fausto
AU - Salvador, Rogério
AU - De Engrácia Moraes, Julieta Rodini
AU - De Moraes, Flávio Ruas
N1 - Publisher Copyright:
© 2015 Universidade de Sao Paulo. Faculdade de Medicina Veterinaria e Zootecnia. All rights reserved.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Homeostasis
KW - Oreochromis niloticus
KW - Teleost
KW - Thermal stress
UR - http://www.scopus.com/inward/record.url?scp=84927777236&partnerID=8YFLogxK
U2 - 10.11606/issn.1678-4456.v52i1p57-62
DO - 10.11606/issn.1678-4456.v52i1p57-62
M3 - Artículo
AN - SCOPUS:84927777236
SN - 1413-9596
VL - 52
SP - 57
EP - 62
JO - Brazilian Journal of Veterinary Research and Animal Science
JF - Brazilian Journal of Veterinary Research and Animal Science
IS - 1
ER -