DAO 91:161-165 (2010)  -  doi:10.3354/dao02260

NOTE
An outbreak of disease caused by Francisella sp. in Nile tilapia Oreochromis niloticus at a recirculation fish farm in the UK

Keith R. Jeffery*, David Stone, Stephen W. Feist, David W. Verner-Jeffreys

Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, Weymouth, Dorset DT4 8UB, UK

ABSTRACT: This study details the first diagnosis of Francisella sp. in tilapia in the United Kingdom. Losses of tilapia fry at a recirculation fish farm in England were investigated, giving a presumptive positive diagnosis of infection with Francisella sp. by histopathological examination. Most fish sampled showed moderate to marked pathology of the major organs, with lesions being present in most tissues. The most obvious host response was granuloma formulation. A subsequent follow-up visit provided further evidence for the presence of a Francisella species. PCR amplicons were obtained using Francisella spp.-specific primers that shared 100% sequence identity with the 16S rRNA gene of the type strain of the species F. asiatica previously described as the cause of disease in tilapia in Southeast Asia and Central America. This outbreak and the subsequent investigation emphasise the importance of strict biosecurity at fish farms and the care that needs to be taken when using a new supplier of fish.


KEY WORDS: Francisellosis · Tilapia · Granulomas · Recirculation


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Cite this article as: Jeffery KR, Stone D, Feist SW, Verner-Jeffreys DW (2010) An outbreak of disease caused by Francisella sp. in Nile tilapia Oreochromis niloticus at a recirculation fish farm in the UK. Dis Aquat Org 91:161-165

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