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 Brycon hilarii (Valenciennes, 1850) Fig. 6 Body deep; greatest depth contained 2.8 to 3.9, caudal peduncle depth 8.6 to 11.8 times in SL; head length 2.9 to 4.7, predorsal distance 2.2 to 2.8, caudal peduncle length 5.5 to 8.1 in SL; snout length 2.9 to 3.8, horizontal orbital diameter 3.3 to 5.1 and least interorbital width 1.9 to 2.7 in HL. Mouth terminal; median row of premaxilla with 3-5, inner row with 4-6, outer row with 7-13, inner row of dentary with 4, outer row 7-14 and maxilla with 11-21 teeth. Lateral line with 67-82 pored scales; transverse series above lateral line with 13-16 scale rows and below with 6-9 scale rows. Dorsal fin with 11, pectoral fin with 12-16, pelvic fin with 8, anal fin with 22-31 and caudal fin with 19 rays ( Lima, 2017 ). Ground color silvery; dark-brown transverse band on caudal peduncle, extending to distal margin of median caudal-fin rays; black transverse humeral blotch, sometimes inconspicuous. Pelvic, anal and caudal fins reddish; dorsal and pectoral hyaline or grey ( Graça, Pavanelli, 2007 ). Maximum standard length. 302.9 mm ( Graça, Pavanelli, 2007 ). Distribution. Río Paraguay and upper rio Amazonas basins ( Eschmeyer et al. , 2017 ). Remarks. Brycon hilarii is a non-native species from the upper rio Paraná and its occurrence can be associated with the releasing of specimens in the Itaipu Reservoir for restocking ( Graça, Pavanelli, 2007 ; Lima, 2017 ).