NOVELTY - Producing biofuel from surface of ocean waters involves: testing water surface of ocean to determine a time period that the water will remain for a biofuel generation; testing water surface to determine a first nutrient that is missing to a first extent that limits growth of a first plant life; applying first missing nutrient; harvesting a first harvested portion of an increased biomass of first plant life; removing a first returnable portion from first harvested portion and spreading it on water surface; and processing the remainder harvested portion into a biofuel component.    USE - For producing biofuel component useful for producing biofuel, particularly bio-diesel, and in cattle fodder (claimed).    ADVANTAGE - The method is cost effective and it reduces the carbon dioxide content in the atmosphere. The Sargassum weed is 5% protein and 95% cellulose and it can be converted into biofuels using catalytic conversion or syngas. The method is more all-encompassing and can be used to process a variety of fuel stocks and is more productive than ethanol produced by yeast fermentation. The Sargassum weed, itself, as well as by-products of the biofuel component processing could also be used for cattle fodder and other purposes.    DETAILED DESCRIPTION - Producing biofuel from surface of ocean waters involves: testing water surface of an ocean to determine a time period that the water will remain for a biofuel generation; testing the water surface to determine a first nutrient that is missing to a first extent that limits the growth of a first plant life; applying first missing nutrient in a form that remains available to first plant life; harvesting a first harvested portion of an increased biomass of first plant life that results from applying; removing a first returnable portion from first harvested portion to leave remainder of the first harvested portion and spreading the first returnable portion on the water surface; and processing the remainder of the first harvested portion into a biofuel component.