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<p>A novel strain, designated F74<sup>T</sup>, was isolated from the gills of a healthy Atlantic salmon, <i>Salmo salar</i> L., at a land-based aquaculture farm located on the Reykjanes peninsula in Iceland. The bacteria were facultative anaerobic, Gram-stain-negative curved rods that were motile and required NaCl for growth. They were sensitive to the vibriostatic agent O/129 and showed growth at 0 °C. The predominant fatty acids were C<sub>16:1</sub> ω7c and/or C<sub>15</sub> iso 2-OH (summed feature 3) (53.5%) and 16:0 (16.7%). The digital genomic DNA G + C content was 41.6%. Comparative analysis of the 16S rRNA gene revealed that the type strain most closely related to F74<sup>T</sup> was <i>Vibrio algarum</i> KJ40-1<sup>T</sup> with a 16S rRNA gene sequence similarity of 98.4%. Other type strains presented similarity of less than 96%. Phylogenetic analysis based on 16S rRNA genes revealed that F74<sup>T</sup> represented a member of the genus <i>Vibrio</i> and exhibited the closest relatedness to <i>V. algarum</i> KJ40-1<sup>T</sup>, which was further confirmed by a phylogenetic analysis based on eight housekeeping genes. <i>In silico</i> DNA–DNA hybridization and ANI comparison of closely related species were far below the corresponding thresholds for discriminating bacterial species. Based on phenotypic, chemotaxonomic and phylogenetic evidence, F74<sup>T</sup> is considered to represent a novel species of the genus <i>Vibrio</i>, for which the name <i>Vibrio frigidus</i> sp. nov. is proposed. The type strain is F74<sup>T</sup> (= DSM 23163<sup>T</sup> = NCIMB 14608<sup>T</sup>).</p>

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Vibrio frigidus sp. nov., Isolated from the Gills of Atlantic Salmon (Salmo salar)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Rannveig Hrólfsdóttir,
  • Viggó Þór Marteinsson,
  • Gunnsteinn Haraldsson,
  • Snædís Björnsdóttir,
  • Eva Benediktsdóttir

摘要

A novel strain, designated F74T, was isolated from the gills of a healthy Atlantic salmon, Salmo salar L., at a land-based aquaculture farm located on the Reykjanes peninsula in Iceland. The bacteria were facultative anaerobic, Gram-stain-negative curved rods that were motile and required NaCl for growth. They were sensitive to the vibriostatic agent O/129 and showed growth at 0 °C. The predominant fatty acids were C16:1 ω7c and/or C15 iso 2-OH (summed feature 3) (53.5%) and 16:0 (16.7%). The digital genomic DNA G + C content was 41.6%. Comparative analysis of the 16S rRNA gene revealed that the type strain most closely related to F74T was Vibrio algarum KJ40-1T with a 16S rRNA gene sequence similarity of 98.4%. Other type strains presented similarity of less than 96%. Phylogenetic analysis based on 16S rRNA genes revealed that F74T represented a member of the genus Vibrio and exhibited the closest relatedness to V. algarum KJ40-1T, which was further confirmed by a phylogenetic analysis based on eight housekeeping genes. In silico DNA–DNA hybridization and ANI comparison of closely related species were far below the corresponding thresholds for discriminating bacterial species. Based on phenotypic, chemotaxonomic and phylogenetic evidence, F74T is considered to represent a novel species of the genus Vibrio, for which the name Vibrio frigidus sp. nov. is proposed. The type strain is F74T (= DSM 23163T = NCIMB 14608T).