Motile aeromonads are a group of loosely associated species within the genus Aeromonas that have similar biochemistry, genetics, and serology. A. hydrophila was the first motile aeromonad species named in addition to causing fish disease, this species can be associated with opportunistic human infections. Strain ML09-119 is an isolate from a disease outbreak on a commercial catfish farm, and it is representative of a clonal group of A. hydrophila isolates that have been causing large-scale disease outbreaks in Alabama and Mississippi since 2009.