Dynamics of piscine francisellosis differs amongst tilapia species (Oreochromis spp.) in a controlled challenge with Francisella noatunensis subsp. orientalis

R. Klinger-Bowen, C. Tamaru, K. McGovern-Hopkins, Y. Li, F. Sithole, M. T. Kearney, S. Francis, Esteban Soto Martinez

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A 25-week immersion challenge was conducted exposing Oreochromis mossambicus, Oreochromis aureus and Oreochromis urolepis hornorum to Francisella noatunensis subsp. orientalis (Fno). Two populations were compared for each fish species; ‘resident fish’ were defined as fish maintained in tanks since week 0 of challenge, whereas ‘naïve fish’ were defined as fish added to tanks once temperature in water reached <26 °C at 21 weeks post-challenge. Fno genome equivalents (GEs) in water were similar in all treatments 1 h post-challenge; however, significantly lower Fno GEs were detected 2 weeks post-challenge in all tanks, and the only treatment with detectable Fno GE after 4 weeks of challenge were the O. mossambicus tanks. Twenty-one weeks post-challenge, naïve fish were stocked with ‘resident’ cohorts. Over a 4-week period, mortalities occurred consistently only in O. mossambicus naïve cohorts. Overall presence of granulomas in spleen of survivors was similar (>55%) in all resident populations; however, in naïve populations, only O. mossambicus presented granulomas. Similarly, only O. mossambicus presented viable Fno in the spleen of survivors, and Fno GEs were only detected in O. mossambicus, and in resident O. aureus. In conclusion, the results of this study suggest different susceptibility of tilapia species to piscine francisellosis.

Original languageEnglish (US)
Pages (from-to)1305-1312
Number of pages8
JournalJournal of Fish Diseases
Volume39
Issue number11
DOIs
StatePublished - Nov 1 2016

Fingerprint

Francisella
Tilapia (Cichlidae)
Tilapia
Oreochromis
Fishes
fish
Oreochromis urolepis hornorum
Oreochromis aureus
aquaculture tanks
Oreochromis mossambicus
Population
granuloma
resident population
Immersion
spleen
Granuloma
water temperature
Spleen
Temperature
Water

Keywords

  • aquaculture
  • Francisella
  • Hawaii
  • Tilapia

ASJC Scopus subject areas

  • Aquatic Science
  • veterinary (miscalleneous)

Cite this

Dynamics of piscine francisellosis differs amongst tilapia species (Oreochromis spp.) in a controlled challenge with Francisella noatunensis subsp. orientalis. / Klinger-Bowen, R.; Tamaru, C.; McGovern-Hopkins, K.; Li, Y.; Sithole, F.; Kearney, M. T.; Francis, S.; Soto Martinez, Esteban.

In: Journal of Fish Diseases, Vol. 39, No. 11, 01.11.2016, p. 1305-1312.

Research output: Contribution to journalArticle

Klinger-Bowen, R. ; Tamaru, C. ; McGovern-Hopkins, K. ; Li, Y. ; Sithole, F. ; Kearney, M. T. ; Francis, S. ; Soto Martinez, Esteban. / Dynamics of piscine francisellosis differs amongst tilapia species (Oreochromis spp.) in a controlled challenge with Francisella noatunensis subsp. orientalis. In: Journal of Fish Diseases. 2016 ; Vol. 39, No. 11. pp. 1305-1312.
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abstract = "A 25-week immersion challenge was conducted exposing Oreochromis mossambicus, Oreochromis aureus and Oreochromis urolepis hornorum to Francisella noatunensis subsp. orientalis (Fno). Two populations were compared for each fish species; ‘resident fish’ were defined as fish maintained in tanks since week 0 of challenge, whereas ‘na{\"i}ve fish’ were defined as fish added to tanks once temperature in water reached <26 °C at 21 weeks post-challenge. Fno genome equivalents (GEs) in water were similar in all treatments 1 h post-challenge; however, significantly lower Fno GEs were detected 2 weeks post-challenge in all tanks, and the only treatment with detectable Fno GE after 4 weeks of challenge were the O. mossambicus tanks. Twenty-one weeks post-challenge, na{\"i}ve fish were stocked with ‘resident’ cohorts. Over a 4-week period, mortalities occurred consistently only in O. mossambicus na{\"i}ve cohorts. Overall presence of granulomas in spleen of survivors was similar (>55{\%}) in all resident populations; however, in na{\"i}ve populations, only O. mossambicus presented granulomas. Similarly, only O. mossambicus presented viable Fno in the spleen of survivors, and Fno GEs were only detected in O. mossambicus, and in resident O. aureus. In conclusion, the results of this study suggest different susceptibility of tilapia species to piscine francisellosis.",
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AU - Li, Y.

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