Brycon hilarii (Valenciennes, 1850)

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111 : 23

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).

Figures

Fig. 6. a. Brycon hilarii, 288.9 mm SL, fresh specimen, uncat. b. Brycon orbignyanus, 270.0 mm SL, fresh specimen, uncat. c. Salminus brasiliensis, 500.0 mm SL, fresh specimen, uncat. d. Salminus hilarii, NUP 1893, 170.0 mm SL, rio Paraná, Porto Rico.