Fish fauna of the trans-Andean Tumbes river basin in northern Peru

To update the knowledge of ichthyofauna Tumbes River basin, we provide a list species. We report 47 species fishes, grouped into 23 families and 11 orders. Characiformes was most diverse order with 12 (25.5% total richness), followed by Carangiformes eight (17%). In our study, two are newly reported from this river basin: Pseudophallus starksii (Jordan & Culver, 1895) Evorthodus minutus Meek Hildebrand 1928. According to salinity tolerance, is composed 20 primary, 14 secondary, 13 peripheral Despite having highest diversity fish on Peruvian Pacific slope, basin one polluted coastal drainages. This study compiles information entire increases known freshwater trans-Andean drainages in Peru, can be used management conservation River.