The ease of M. hydrocarbonoclasticus to form biofilms at the interface of water and hydrophobic hydrocarbons has been demonstrated , which is consistent with our observation of this species becoming dominant in the carbon brush anode of the hypersaline MFC. Although its presence in the bulk fluid is also high, the species abundance percentages are inverted in the anode with respect to the bulk fluid as M. hydrocarbonoclasticus has greater capacity to form biofilm than H. praevalens . The presence of M. hydrocarbonoclasticus in electroactive biofilms has also been reported, specifically in marine electroactive biocathodes for biosensor applications .