Dynamics of piscine francisellosis differs amongst tilapia species (Oreochromis spp.) in a controlled challenge with Francisella noatunensis subsp. orientalis
| Autor: | Stewart Francis, Y Li, Esteban Soto, Clyde S. Tamaru, Michael T. Kearney, Fortune Sithole, Kathleen McGovern-Hopkins, R Klinger-Bowen |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Oreochromis mossambicus food.ingredient Veterinary (miscellaneous) Zoology Aquatic Science Fish Diseases 03 medical and health sciences food Species Specificity Aquaculture Animals Oreochromis aureus Francisella Oreochromis urolepis hornorum biology business.industry Ecology Incidence Francisella noatunensis Tilapia Cichlids 04 agricultural and veterinary sciences biology.organism_classification Oreochromis 030104 developmental biology 040102 fisheries 0401 agriculture forestry and fisheries Gram-Negative Bacterial Infections business |
| Zdroj: | Journal of Fish Diseases. 39:1305-1312 |
| ISSN: | 0140-7775 |
| DOI: | 10.1111/jfd.12461 |
| Popis: | 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 reached26 °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. |
| Databáze: | OpenAIRE |
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