Method of fermentation discoloration of chlorella biomass protothecoides

The invention relates to a method of bleaching a type of microalgae Chlorella protothecoides biomass rich in proteins, biomass produced by fermentation, characterized in that one: - chooses to produce the microalgae in heterotrophic biomass and in continuous fermentation conditions, - varying the coloration of said biomass by controlling the ratio of the growth rate μ / pmax.