Figure 2.

Bar graphs of bacterial Operational Taxonomic Units (OTUs) at the genus level based on V6–V4 rRNA gene amplicon sequencing from moribund freshwater and marine fish microbiomes from a Massachusetts pet shop. Marine species displayed larger relative abundances of Vibrio genera, while freshwater species showed dominance by Photobacterium or Aeromonas. All three genera include species potentially pathogenic to fishes. The V6–V4 hypervariable region cannot differentiate between certain species of vibrios, hence some of the vibrios are designated spp.