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Characterization of a bacterium isolated from diseased rock sea bream, Oplegnathus fasciatus, during low water temperature season in Jeju island  

Go, Dae-Hui (국립수산물품질검사원 제주지원)
Jin, Chang-Nam (제주지방해양수산청)
Lee, Chang-Hun (국립수산과학원)
Park, Geun-Tae (제주대학교)
Heo, Mun-Su (제주대학교)
Publication Information
Journal of fish pathology / v.17, no.2, 2004 , pp. 83-90 More about this Journal
Abstract
The outbreak of haemorrhagic specticemia and lesions in dermis, frequently associated with keratitis have occured on rock sea bream (Oplegnathus fasciatus) reared in Jeju island. A bacterium isolated from the diseased fish identified as Pseudomonas sp. by morphologic, cultural, and biochemical tests. The bacterium was identified Pseudomonas anguilliseptica according to 16S rDNA sequence analysis. The highest growth rate of this strain was obtained at 20 to $\25^circ{C}$ although the disease occurred mostly below $16^\circ{C}$. The challenge test by ip injection revealed that this bacterium was pathogenic to rock sea bream. All experimental fish in challenged by ip injection died within 21 days but there was no death in control group. The bacterium was sensitive to Doxycycline, Chloramphenicol, Ciprofloxacin, Erythromycin, Flumequine, Nalidixic acid, Norfloxacin, and Ofloxacin.
Keywords
cold water disease, haemorrhagic specticemia, keratitis, Pseudomonas anguilliseptica, rock sea bream
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