These features of Marinobacter hydrocarbonoclasticus are highly beneficial for MFCs aimed at organic degradation and electricity generation under extreme saline conditions. For example, the presence of M. hydrocarbonoclasticus may explain the higher COD removal efficiency of this MFC (68%) compared to another hyper-saline MFC populated primarily by Halanaerobium species (20%). This suggests the possibility that M. hydrocarbonoclasticus may hydrolyze complex hydrocarbons and convert them to substrates that could be fermented by other organisms (e.g., Halanaerobiumspp.), enabling potential commensalistic relationships that benefitoverall MFC performance. The microbial analysis of the MFC, bothof bulk fluid and anode, shows that M. hydrocarbonoclasticus and H. praevalens, both autochthonous bacteria from the Barnett shale formation, can coexist in an electroactive biofilm of an hypersaline MFC and contribute to electrical power production. This highlightsthat MFCs have the potential to be fed and perform with bacteria from real produced wastewaters, demonstrating the potential feasibility of the hypersaline MFC for oil and gas produced wastewater treatment.