Abstract
European catfish (Silurus glanis) is one more non-native species that was introduced to the rivers of the Iberian Peninsula. This work presents the dispersion pattern of this species in the River Tagus from the first record in Spain in 1998 to the present time. More than 80 records were obtained mainly from anglers’ fora and blogs. It is currently estimated that this species is distributed over more than 700 km of river network, occurring mainly in reservoirs and in high-order reaches. In addition, the diet of fish caught in the River Tagus by professional fishermen during 2016 and 2017 was analyzed and the preliminary results are presented. Diet composition varied between habitats (lentic vs lotic) and Crustaceans followed by Teleosts were the most representative prey. Also discussed are the impacts of this non-native species on the composition, structure and functioning of the River Tagus ecosystem.
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