Method for producing branched aldehydes, comprising the following steps: (a) providing a culture of one or more fungi of the genus Conidiobolus, selected from the species C. denaeosporus or C. heterosporus, and production of biomass with an amount of branched carbonic acids in free form and/or bound form as glycerides: (b) extraction of the biomass of step (a) for the production of a first intermediate product, containing free and/or bound carbonic acids; (c) optionally chemical, enzymatic or microbial hydrolysis of the bound carbonic acids of the first intermediate product; and (d) treatment of the first intermediate product with a reducing agent of chemical nature for transmission of the free and/or bound carbonic acids into the respective alcohols as well as optional separation of one or further alcohols of disturbing side components and production of the chemically produced second intermediate product, which contains these alcohols as a mixture or in enriched form; and (f) treatment of the chemically produced second intermediate product with an oxidizing agent of chemical nature for transmission of the free and/or bound alcohols into the respective aldehydes; or (e) treatment of the first intermediate product with a reducing agent of biological nature for transmission of the free and/or bound carbonic acids into the respective aldehydes with the same number of carbon atoms compared to the free and/or bound carbonic acids or into the corresponding aldehydes with a number of carbon atoms reduced by one compared to the free and/or bound carbonic acids and production of the biologically produced second intermediate product, which contains these aldehydes; as well as optionally (g) removal of disturbing side components from the fractions obtainable after steps (d) and/or (e) and/or (f). (a) providing a culture of one or more fungi of the genus Conidiobolus, selected from the species C. denaeosporus or C. heterosporus, and production of biomass with an amount of branched carbonic acids in free form and/or bound form as glycerides: (b) extraction of the biomass of step (a) for the production of a first intermediate product, containing free and/or bound carbonic acids; (c) optionally chemical, enzymatic or microbial hydrolysis of the bound carbonic acids of the first intermediate product; and (d) treatment of the first intermediate product with a reducing agent of chemical nature for transmission of the free and/or bound carbonic acids into the respective alcohols as well as optional separation of one or further alcohols of disturbing side components and production of the chemically produced second intermediate product, which contains these alcohols as a mixture or in enriched form; and (f) treatment of the chemically produced second intermediate product with an oxidizing agent of chemical nature for transmission of the free and/or bound alcohols into the respective aldehydes; or (e) treatment of the first intermediate product with a reducing agent of biological nature for transmission of the free and/or bound carbonic acids into the respective aldehydes with the same number of carbon atoms compared to the free and/or bound carbonic acids or into the corresponding aldehydes with a number of carbon atoms reduced by one compared to the free and/or bound carbonic acids and production of the biologically produced second intermediate product, which contains these aldehydes; as well as optionally (g) removal of disturbing side components from the fractions obtainable after steps (d) and/or (e) and/or (f). <EOS>