| Summary: | This study presents a novel <i>Janthinobacterium</i> strain, SNU WT3, isolated from the kidney of rainbow trout. A phylogenetic study using 16S rRNA sequences indicated that the strain is closely related to <i>Janthinobacterium svalbardensis</i> JA-1<sup>T</sup>. However, biochemical analysis found differences in D-xylose adonitol, N-acetylglucosamine, arbutin, and cellobiose. As for genome-to-genome distance and average nucleotide identity values calculated between strain SNU WT3 and other related strains such as <i>J. lividum</i> EIF1, <i>J. svalbardensis</i> PAMC 27463, and <i>J. agaricidamnosum</i> BHSEK were all below the cutoff value between species. DNA-DNA hybridization between strain SNU WT3 and other close relatives indicated the results of <i>J. lividum</i> DSM 1522<sup>T</sup> (47.11%) and <i>J. svalbardensis</i> JA-1<sup>T</sup> (38.88%) individually. The major fatty acid compositions of strain SNU WT3 were cylco-C<sub>17:0</sub> (41.45%), C<sub>16:0</sub> (33.86%) and C<sub>12:0</sub> (5.87%). The major polar lipids were phosphatidylethanolamine, phosphatidylcholine, phosphatidylglycerol, and diphosphatidylglycerol. The quinone system was composed mainly of ubiquinone Q-8. The genome of strain SNU WT3 consists of 6,314,370 bp with a G + C content of 62.35%. Here, we describe a novel species of the genus <i>Janthinobacterium</i>, and the name <i>Janthinobacterium tructae</i> has been proposed with SNU WT3<sup>T</sup> (=KCTC 72518 = JCM 33613) as the type strain.
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