Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated Author Ota, Renata Rúbia Author Deprá, Gabriel de Carvalho Author Graça, Weferson Júnio da Author Pavanelli, Carla Simone text Neotropical Ichthyology 2018 2018-06-11 16 2 1 111 journal article 10.1590/1982-0224-20170094 f68fe85c-2a4c-4625-b684-74f61398d6c2 1982-0224 3678395 Bryconamericus exodon Eigenmann, 1907 Fig. 11 Body elongated; greatest body depth contained 3.8 to 4.2 and caudal peduncle depth 10.6 to 11.2 times in SL; head length 4.1 to 4.3, predorsal distance 2.1 to 2.2, and caudal peduncle length 6.7 to 7.1; snout length 3.5 to 4.0, horizontal orbital diameter 2.2 to 2.5 and interorbital distance 2.4 to 2.8 in HL. Mouth terminal; inner row of premaxilla with 4, outer row with 5; dentary with 9 or 10, and maxilla with 2 or 3 teeth. Lateral line with 36-38 pored scales; transverse series above lateral line with 4 or 5 rows and below with 3 scale rows. Dorsal fin with 11 or 12, pectoral fin with 14 or 15, pelvic fin 9, anal fin rays 22-26, and caudal with 19 rays. Ground color pale yellow; black vertically elongated humeral spot; silvery longitudinal band (brown or grey in fixed specimens), from humeral spot to caudal peduncle. Yellowish fins; distal margin of caudal-fin lobes black ( Graça, Pavanelli, 2007 ). Maximum standard length. 62.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Río Paraguay and upper rio Paraná basins. Remarks. Bryconamericus exodon is a non-native species from the upper rio Paraná , and its occurrence can be associated with the functioning of the Canal da Piracema (a fish ladder that connects the region downstream from the Itaipu Dam to the region upstream from the dam).