Whole-Genome Sequencing of a Potentially Novel Species Isolated from Diseased Siberian Sturgeon () Using Oxford Nanopore Sequencing.

spp. are opportunistic pathogens that are widely distributed in water sources, with several species being associated with fish and human diseases. We have previously identified an AB005 isolate from diseased . This isolate was identified as based on the 16S rRNA and gene sequences. However, this novel strain does not produce indole and tested negative for ornithine decarboxylase and d-xylose fermentation-differences that set it apart from typical strains. In the present study, this strain was subjected to whole-genome sequencing and compared with the genomes of the type strain ( ATCC 7966) and other spp. Comprehensive genome analysis suggests that AB005 represents a distinct species within the genus. The draft genome of the AB005 strain comprises 4,780,815 base pairs with a GC content of 61.2% and contains 6104 predicted protein-coding sequences along with numerous genes implicated in antibiotic resistance. The core/pan-genome analysis reveals extensive genetic diversity, indicative of a dynamic genomic structure. These findings collectively underscore the taxonomic distinction of the AB005 strain as a novel species and highlight its potential pathogenic implications in aquaculture and public health settings.