enterovibrio nigricans enterovibrio nigricans enterovibrio nigricans is a bacterium species from the genus of enterovibrio which has been isolated from the head kidney of the fish sparus aurata from the mediterranean coast in spain. enterovibrio nigricans scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: vibrionales family: vibrionaceae genus: enterovibrio species: e. nigricans binomial name enterovibrio nigricanspascual et al. 2009 type strain dal 1-1-5