An outbreak of granulomatous inflammation associated with Francisella noatunensis subsp. orientalis in farmed tilapia (Oreochromis niloticus × O. aureus) in China

In 2013, a novel disease was detected in tilapia ( Oreochromis niloticus × O. aureus ) in Guangzhou, South China. To identify the causative pathogen, we conducted histological examination, bacteria isolation, and purification, and sequenced the 16S rRNA gene of isolates. Infected fish had a large nu...

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Bibliographic Details
Published in:Chinese journal of oceanology and limnology 2016-05, Vol.34 (3), p.460-466
Main Authors: Lin, Qiang, Li, Ningqiu, Fu, Xiaozhe, Hu, Qiandong, Chang, Ouqin, Liu, Lihui, Zhang, Defeng, Wang, Guangjun, San, Guibao, Wu, Shuqin
Format: Article
Language:English
Subjects:
Aquaculture
Bacteria
Biology
Brackish
Earth and Environmental Science
Earth Sciences
Fish
Francisella
Freshwater fishes
Granulomas
Heart
Inflammation
Kidneys
Marine
Marine fishes
Oceanography
Oreochromis niloticus
Pathogens
Ribonucleic acid
RNA
rRNA 16S
Spleen
Tilapia
Water purification
Whitefish
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Summary:In 2013, a novel disease was detected in tilapia ( Oreochromis niloticus × O. aureus ) in Guangzhou, South China. To identify the causative pathogen, we conducted histological examination, bacteria isolation, and purification, and sequenced the 16S rRNA gene of isolates. Infected fish had a large number of white granulomas in the kidney, liver, heart, and spleen. The head kidney and spleen were markedly swollen. A bacterium strain designated as gz201301 was recovered from the spleen of infected tilapia. The 16S rRNA sequence of gz201301 revealed that it was highly similar to F. noatunensis subsp. orientalis . This is the first report of a Francisella -like infection in farmed tilapia in China.
ISSN:0254-4059
2096-5508
1993-5005
2523-3521
DOI:10.1007/s00343-016-4311-2