Inventario de las especies de peces del río Abuná (Pando, Bolivia)

Abstract

The Abuná River is one of the main tributaries of the Abuná subbasin and represents the natural border between Bolivia and the Federative Republic of Brazil. We evaluated 23 sites in rivers, streams, and lakes, with the objective of compiling an inventory of the fish species. To this end, intensive collections were made using gillnets and trawls on the banks, obtaining a total of 4 449 individuals. One hundred and seventy-eight species distributed in 34 families and 10 orders were identified. The orders Characiformes (85), Siluriformes (62), and Cichliformes (12) were the most diverse and abundant. The families with the highest number of species were Acestrorhamphidae (18), Loricariidae (18), Pimelodidae (14), Auchenipteridae (13) and Serrasalmidae, Cichlidae and Curimatidae (12 species each). The remaining families had fewer than nine species. Eighty-six new records were added to the previously known richness in the subbasin, of which 16 correspond to new records for the department of Pando, and 13 species are reported for the first time in Bolivia.