Note
The suitability of different Gracilaria spp. and two Sargassum species for bioconversion to methane was determined through bioassays of methane yield. Gracilaria species and strains were excellent feedstocks for high methane yields, ranging from 0.28 to 0.40 m3 kg -1 volatile solids added. These yields ranged from 58 to 95% of theoretical stoichiometric yields. Methane yields were highly correlated with acid soluble carbohydrate components of the Gracilaria spp.