DESCRIZIONE
The invention relates to a method for the protein enrichment of a microalga cultivated under heterotrophic conditions, of the genus Chlorella, and more particularly Chlorella protothecoides, characterised in that it comprises: - a first step intended to limit the supply of ammonium in such a way as to obtain a microalgal biomass having a protein content of less than 50 % expressed in N. 6.25, preferably of less than 30 %, and more preferably of between 20 and 25 %; - a second step in which the supply of ammonium in the fermentation medium is increased in such a way as to obtain a protein content of greater than 0 %, preferably of greater than 60 %, and more preferably of greater than 65 %.