The present invention relates to a strain of a novel microalgae belonging to Nitsushia (Nitzschia) genus, the strain, lipids, more specifically docosahexaenoic acid (DHA) and / or eicosapentaenoic acid (EPA), and / or carotenoids, Especially fucoxanthin, it makes it possible to get a high yield under mixotrophic mode. The present invention, such strains, variable and / or discontinuous light source is especially using flash lighting, also relates to a method of selecting and culturing. .BACKGROUND
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