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Chryseobacterium oncorhynchi sp. nov., isolated from rainbow trout (Oncorhynchus mykiss).

Journal article
Authors L Zamora
J F Fernández-Garayzábal
M A Palacios
C Sánchez-Porro
Liselott Svensson-Stadler
L Domínguez
Edward R.B. Moore
A Ventosa
A I Vela
Published in Systematic and applied microbiology
Volume 35
Issue 1
Pages 24-9
ISSN 1618-0984
Publication year 2012
Published at Institute of Biomedicine, Department of Infectious Medicine
Pages 24-9
Language en
Keywords Animals, Bacterial Typing Techniques, Base Composition, Catalase, metabolism, Chryseobacterium, classification, genetics, isolation & purification, physiology, Cluster Analysis, DNA, Bacterial, chemistry, genetics, DNA, Ribosomal, chemistry, genetics, Fatty Acids, analysis, Gills, microbiology, Liver, microbiology, Molecular Sequence Data, Nucleic Acid Hybridization, Oncorhynchus mykiss, microbiology, Oxidoreductases, metabolism, Phylogeny, Quinones, analysis, RNA, Ribosomal, 16S, genetics, Sequence Analysis, DNA
Subject categories Microbiology


Genotypic and phenotypic analyses were performed on five Gram-negative, catalase and oxidase-positive, rod-shaped bacteria isolated from the gill and liver of four rainbow trout. Studies based on comparative 16S rRNA gene sequence analysis showed that the five new isolates shared 99.8-100% sequence similarity and that they belong to the genus Chryseobacterium. The nearest phylogenetic neighbours of the strain 701B-08(T) were Chryseobacterium ureilyticum F-Fue-04IIIaaaa(T) (99.1% 16S rRNA gene sequence similarity) and Chryseobacterium joosteii LMG 18212(T) (98.6%). DNA-DNA hybridization values between the five isolates were 91-99% and ranged from 2 to 53% between strain 701B-08(T) and the type strains of phylogenetically closely related species of Chryseobacterium. Strain 701B-08(T) had a DNA G+C content of 36.3 mol%, the major fatty acids were iso-C(15:0), iso-C(17:1)ω9c, C(16:1)ω6c and iso-C(17:0) 3-OH and the predominant respiratory quinone was MK-6. The novel isolates were distinguished from related Chryseobacterium species by physiological and biochemical tests. The genotypic and phenotypic properties of the isolates from rainbow trout suggest their classification as representatives of a novel species of the genus Chryseobacterium, for which the name Chryseobacterium oncorhynchi sp. nov. is proposed. The type strain is 701B-08(T) (=CECT 7794(T)=CCUG 60105(T)).

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