Abstract: Until recently research on fish migration and fish passage efficiency mainly targeted diadromous species, while there is still a significant knowledge gap on endemic potamodromous. In this study, carried out during the period October 2010-October 2011, the movements of radio-tagged marble trout (Salmo marmoratus; N=28) and Italian barbel (Barbus plebejus; N=31) along the lower course of Chiusella river and Dora Baltea river (NW Italy) were analysed during migration periods, with a particular focus on passage at a partial width nature-like fish ramp built on a 3m high weir. The monitoring, carried out through automatic stations and weekly manual tracking sessions, allowed to collect data on the behaviour of marble trout (repeated up and downstream passages, homing behaviour, use of the ramp as habitat) and on the significant impact of avian predation during winter (> 28% by cormorant (Phalacrocorax carbo)); on the other hand, high flow conditions in late spring affected the study on Italian barbel, preventing to catch larger spawners and creating challenging hydrodynamic conditions at the obstacle. Only the passage of the largest tagged individual (33 cm, 531 g) was recorded, while the peak in downstream migration towards the deeper reaches of Dora Baltea river was clearly identified.