A study was made of the use of laminaran extracted from algae Laminaria saccharina and L. digitata with mineral acid solutions if the mixture was heated. The extract was neutralized to pH 4.0. The glucose solution obtained was used to culture fodder yeasts Candida scotti and Hansenula anomalia. The yield of yeast biomass amounted to 87-83% of the medium utilized. The yeast biomass grown in the media with Laminaria extracts contained 43-50% protein. © 1991 Kluwer Academic Publishers.