[Possible action of riboflavin (vitamin B2) as a chemical telemediator in aquatic ecosystems (author's transl)].

The attractive action of riboflavin at certain concentrations on the young Salmon (parr) has been demonstrated. This property diminished or disappears with smoltifications. Owing to the emission of riboflavin by the young Salmon, the possibility, at diverse migratory or sedentary phases of the biological cycle, of an action of a pheromone or ecomone type, is discussed.