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Oceanobacillus oncorhynchi sp. nov., a halotolerant obligate alkaliphile isolated from the skin of a rainbow trout (Oncorhynchus mykiss), and emended description of the genus Oceanobacillus

¹ Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan
² Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan
³ Laboratory of Electron Microscopy, Graduate School of Dentistry, Hokkaido University, Kita-ku, Sapporo 060-8586, Japan

Correspondence
Isao Yumoto
i.yumoto{at}aist.go.jp

A halotolerant, obligately alkaliphilic bacterium, R-2^T, was isolated from the skin of a rainbow trout (Oncorhynchus mykiss), a freshwater fish. The strain is Gram-positive, ferments several carbohydrates, is rod-shaped and motile by peritrichous flagella and produces ellipsoidal spores. The isolate grows at pH 9–10 but not at pH 7–8. This micro-organism grows in 0–22 % (w/v) NaCl at pH 10. Its major cellular fatty acids are iso-C_{15 : 0}, anteiso-C_{15 : 0} and anteiso-C_{17 : 0}, the major isoprenoid quinone is MK-7 and the DNA G+C content is 38·5 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicates that strain R-2^T is a member of the genus Oceanobacillus. DNA–DNA hybridization reveals low relatedness between the isolate and Oceanobacillus iheyensis (21·0 %). On the basis of phenotypic characteristics, phylogenetic data and DNA–DNA relatedness data, the isolate should be designated as a novel species, for which the name Oceanobacillus oncorhynchi sp. nov. is proposed. The type strain is R-2^T (=JCM 12661^T=NCIMB 14022^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain R-2^T is AB188089.

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