NOVELTY - Using (M1) algae as a biofuel involves providing mixture containing algae and filtration media; and burning the mixture to generate heat.    USE - As a biofuel (claimed); and as bioenergy, supplemented animal feed, food supplements, and algae oil.    ADVANTAGE - The present method provides collection of algae by using filtration media, where the filtrate is then recycled back through the filtration media until the desired level of removal is achieved, or the filtrate is returned to the source of algae. The filtrate is used for irrigation or otherwise discharged from the system. Unlike existing algae harvesting methods, algae collected according to the present method does not have to be separated from the filtration media for use. Rather, the algae and filtration media mixture is itself a useable product. The algae and filtration media mixture is used as a biofuel and burned or combusted to produce heat and/or energy. The method is used with native algae sources, and do not require special cultivation procedures or manipulation of the algae source (such as increasing salinity, or manipulating lipid content by supplying extra or special nutrients, or modifying growth conditions). This decreases the overall energy input of the system and provides a more natural bioenergy source compared to existing algae harvesting methods which often rely on especially cultured algae sources.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) harvesting (M2) algae for livestock feed or food supplements involving providing algae suspension comprising algae dispersed in liquid medium, contacting the algae suspension with filtration media, where the algae is collected by the filtration media to yield algae and filtration media mixture, and without separating the algae from the filtration media, using the mixture as livestock feed or a food supplement; and    (2) composition for use as a biofuel, livestock feed, or food supplement comprising mixture of algae and filtration media.