Movement behaviour and fishway performance for endemic and exotic species in a large anthropized river

Studies of fishway performance, at the multi-species level in large rivers, are scarce and this raises question passage success both endemic exotic species anthropised environments. The study was conducted downstream part River Meuse (average annual discharge = 400 m3.s-1) on a 13 km transect between two successive fishways (M0 M1). From 2015–2021, total 1065 adult individuals, representing 14 potamodromous (including asp Aspius aspius catfish Silurus glanis as exotics) diadromous species, were captured trap Lixhe (M0), individually tagged (using biocompatible RFID tags-Radio Frequency Identification), released upstream M0. To analyse performance M1 vertical slot using standardised metrics, detection station placed with one antenna entrance most pool (5.7 m height 18 pools). With 456 individuals detected fishway, ascending rate from M0 to 42.8% (the common bream, Abramis brama achieving best 85.7%); (catfish asp) reached 21.5% 30.5%, respectively. adjusted for (94.9%) followed by trout, Salmo trutta (90.0%). median time cross shorter trout (median 01h08) longer eel Anguilla anguilla 21h17); also very fast 1h31). hourly variable, some migrating during daylight, dark periods or entire 24 h cycle. multispecies studied presented terms success, an international level, associated good transit times. It allows which will increase their expansion area.