halanaerobium fermentans halanaerobium fermentans halanaerobium fermentans is a gram-negative and strictly anaerobic bacterium from the genus of halanaerobium which has been isolated from puffer fish ovaries. halanaerobium fermentans scientific classification domain: bacteria phylum: bacillota class: clostridia order: halanaerobiales family: halanaerobiaceae genus: halanaerobium species: h. fermentans binomial name halanaerobium fermentanskobayashi et al. 2000 synonyms haloanaerobium fermentanshaloanaerobium fermentum