A device for selecting eukaryotic cells (SP), said device including a transportation channel (100), in which a solution containing said eukaryotic cells (SP) can circulate, a first through passage (104) opening into said transportation channel (100), a source of electromagnetic radiation (60), which is coupled to a first end of a first optical fiber (61), the other emission end (61b) of the first optical fiber being inserted into said first through passage (104), without protruding into the transportation channel (100), said device further including electronic control means (7), for controling said source of electromagnetic radiation (60) automatically, so as to selectively alter the eukaryotic cells (SP) circulating in the transportation channel (100), by means of the electromagnetic alteration radiation (R) emitted by the source of electromagnetic radiation (60).