Abstract
Thirteen pikeperch Sander lucioperca were implanted with acoustic transmitters and 10 were successfully tracked twice a week from March to early July in a drainage canal connected to a brackish lagoon located in the Rhône delta. Pikeperch was found in the main canal and in narrow tributaries, but never in the lagoon. Pikeperch avoided shallow parts of the canal and selected areas with high riparian vegetation (mainly trees). No between sexes differences occurred in habitat selection. At the basin scale, while both sexes remained in the upstream part of the canal during the spawning period, after spawning, females migrated downstream and also into the tributaries. This migration may have been induced by the movement of prey while males remained guarding the nests.