Evaluation of resistance against Streptococcus agalactiae in four farmed strains of Nile tilapia (Oreochromis niloticus)

Autores/as

DOI:

https://doi.org/10.5433/1679-0359.2020v41n1p351

Palabras clave:

Disease resistance, Streptococcosis, Challenge test, Nile tilapia.

Resumen

Nile tilapia (Oreochromis niloticus) has always been considered more resistant to diseases compared to other fish species. However, in recent decades, this fish species has also been susceptible to many bacterial, fungal, parasitic, and nutritional diseases. In Brazil, streptococcosis is one of the main diseases that affect tilapia and has caused many economic losses. A resistance test was conducted with 93 tilapia of four varieties (UFLA strain and three commercial varieties: SC1, SC2, and SC3) to evaluate resistance to experimental inoculation with Streptococcus agalactiae. Each variety was distributed in five aquariums, with nine specimens of the same variety. Among the five aquariums, four housed fish were intraperitoneally inoculated with 107 CFU/fish of S. agalactiae and one aquarium harbored fish from the control group, which received 0.1 mL of sterile BHI (Brain Heart Infusion). Significant differences were observed in the survival rates accumulated at the end of the experiment (day 15), with values of 22, 36, 36, and 15% for SC1, SC2, SC3, and UFLA, respectively. The UFLA strain presented lower survival than other strains, which did not differ among the 15 days of challenge. These results demonstrate that there are animals with a better response to the resistance test than others.

Biografía del autor/a

Gláucia Frasnelli Mian, Universidade Federal de Lavras

Prof., Universidade Federal de Lavras, UFLA, Lavras, MG, Brasil.

Charles Oswaldo Roncancio, Fundación Universitaria San Martín

Prof., Fundación Universitaria San Martín, FUSM, Bogotá, Colombia.

Maria Cristina de Souza Silva, Universidade Federal de Lavras

Discente, UFLA, Lavras, MG, Brasil.

Amanda Carvalho Rosado Ferreira, Universidade Federal de Lavras

Discente, UFLA, Lavras, MG, Brasil.

Dircéia Aparecida da Costa Custódio, Universidade Federal de Lavras

Discente, UFLA, Lavras, MG, Brasil.

Victor Hugo Silva Souza, Universidade Federal de Lavras

Discente, UFLA, Lavras, MG, Brasil.

Geraldo Márcio da Costa, Universidade Federal de Lavras

Prof., UFLA, Lavras, MG, Brasil.

Citas

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Publicado

2020-01-10

Cómo citar

Mian, G. F., Roncancio, C. O., Silva, M. C. de S., Ferreira, A. C. R., Custódio, D. A. da C., Souza, V. H. S., & Costa, G. M. da. (2020). Evaluation of resistance against Streptococcus agalactiae in four farmed strains of Nile tilapia (Oreochromis niloticus). Semina: Ciências Agrárias, 41(1), 351–356. https://doi.org/10.5433/1679-0359.2020v41n1p351

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