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Diseases of Aquatic Organisms

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DAO 133:141-145 (2019)  -  DOI: https://doi.org/10.3354/dao03333

NOTE
Characterization of Francisella noatunensis subsp. orientalis isolated from Nile tilapia Oreochromis niloticus farmed in Lake Yojoa, Honduras

Esteban Soto1,*, Khalid Shahin2, J. Johnny Talhami3, Matt J. Griffin4, Alexandra Adams2, J. Gustavo Ramírez-Paredes2

1Department of Medicine and Epidemiology, University of California, School of Veterinary Medicine, Davis, CA 95616, USA
2Institute of Aquaculture, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK
3Hondu Tilapia, Yoro, Honduras
4Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Box 197, Stoneville, MS 38776, USA
*Corresponding author:

ABSTRACT: Francisella noatunensis subsp. orientalis (Fno) is a Gram-negative, pleomorphic, facultative intracellular bacterial pathogen affecting a variety of cultured and wild fish species. Outbreaks of piscine francisellosis in warmwater fish have been documented worldwide; however, reports of Fno from Central America have been limited to a single documented outbreak in cultured tilapia in Costa Rica in 2007. From 2015 to 2017, Fno was consistently recovered from disease outbreaks in Nile tilapia Oreochromis niloticus cultivated in floating cages in Lake Yojoa, Honduras. Mortality rates during these outbreaks ranged from 50 to 85%. Fno was isolated by aerobic culture on selective media and identity confirmed by Fno-specific PCR. Repetitive extragenic palindromic PCR analysis revealed that the case isolates were genetically homogeneous with archived strains recovered from epizootics in cultured tilapia from Costa Rica and Mexico, suggesting the same strain of Fno was responsible for these otherwise unrelated fish kills. The current study provides only the second report of Fno in Central America and characterizes the first Fno outbreak in cultured fish in Honduras.


KEY WORDS: Tilapia · Francisellosis · Aquaculture · Bacteria · Honduras · Latin America


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Cite this article as: Soto E, Shahin K, Talhami JJ, Griffin MJ, Adams A, Ramírez-Paredes JG (2019) Characterization of Francisella noatunensis subsp. orientalis isolated from Nile tilapia Oreochromis niloticus farmed in Lake Yojoa, Honduras. Dis Aquat Org 133:141-145. https://doi.org/10.3354/dao03333

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