First report of Shewanella sp. and Listonella sp. infection in freshwater cultured loach,Misgurnus anguillicaudatus |
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Authors: | Lei Qin Ming Zhu Jing Xu |
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Institution: | College of Marine Science, Huaihai Institute of Technology, , Lianyungang, 222005 China |
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Abstract: | A novel disease outbreak occurred among cultured loach, Misgurnus anguillicaudatus in China. The diseased fish displayed lethargy, loss of appetite, black discolouration, anasarca and ventral skin hyperaemia. Clinical signs were observed in most of the fish examined, which consisted of discoloured liver, swollen spleen and petechial haemorrhage in the intestine and peritoneal membranes. The causative agent was found to be two species of bacteria by experimental infection, identified as Shewanella sp. and Listonella sp. The result showed that these were likely to be Shewanella putrefaciens and Listonella anguillarum respectively. Bacterial identification consisted of physiological and biochemical tests as well as 16S rRNA sequence analysis. In addition, antibiotic susceptibility testing was performed, revealing that Shewanella putrefaciens and Listonella anguillarum were susceptible to enrofloxacin, ciprofloxacin, levofloxacin, pipemidicacid and norfloxacin. This is the first report of S. putrefaciens and L. anguillarum from cultured loach. |
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Keywords: |
Misgurnus anguillicaudatus
Shewanella putrefaciens
Listonella
anguillarum
16S rRNA antibiotic susceptibility testing |
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