Phenology and biological traits of migrating salmon (Salmo salar) sampled by trapping in the survey in the Bresle river (France)

Since 1982, migratory salmon have been captured on the Bresle basin to observe migration phenology and quantify their abundance. 15 km from the river estuary a trapping system controls salmon migration and since 1994 an upstream trap captures salmon in their upstream migration 3 km from the estuary. On the occasion of the capture, biometric characteristics are taken to characterize the population in order to feed this data set