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Marine biomass is considered an important feedstock for anaerobic digestion to generate energy; however, its utilization as an energy source is still minimal around the world. In the current study, the biochemical methane potential test was used to evaluate energy recovery from seaweed, brown algae, green algae, and fish viscera as substrates for methane production. Cumulative CH₄ yields of 256 ± 28 and 179 ± 35 mL CH₄/g VS were observed using green and brown algae, respectively, after 60 days of digestion. The CH₄ content of the biogas was approximately 70% for both substrates. Lower CH₄ yields of 127 ± 20 and 102 ± 25 mL CH₄/g VS were observed using fish viscera and seaweed, respectively. Given that 44 ± 15% of the TCOD was converted to CH₄, a longer adaption period or pretreatment of the marine biomass is necessary to fully convert the TCOD to CH₄.