The invention relates to a device (10) for producing microalgae comprising a basin (12) containing an aqueous medium and a mobile support (14) capable of receiving a cell culture consisting of algae cells, which mobile support is immersed at least partially in the aqueous medium and has at least a first portion and a second portion, characterized in that the movable support is arranged in the basin so that the first portion is exposed directly to a main light source (18) and forms a exposure section (24), and the second portion is not exposed directly to the main light source (18) and forms an inhibition section (26), the device (10) further comprising a light source secondary (28) arranged to emit actinic light in the direction of the inhibition section (26) so as to inhibit the pigment synthesis of at least some of said algae cells. The invention also relates to a method for producing microalgae.
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