Brycon orbignyanus (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 : 25

Brycon orbignyanus (Valenciennes, 1850)

Fig. 6

Body deep; greatest depth contained 2.8 to 3.4, caudal peduncle depth 9.2 to 11.7 times in SL; head length 3.3 to 5.1, predorsal distance 1.8 to 2.1, caudal peduncle length 5.3 to 7.8 in SL; snout length 2.7 to 3.6, horizontal orbital diameter 3.1 to 5.0 and least interorbital width 2.1 to 3.0 in HL. Mouth terminal; median row of premaxilla with 2-4, inner row with 5-9, outer row with 9-13, inner row of dentary with 4, outer row 8-14 and maxilla with 11-20 teeth. Lateral line with 52-63 pored scales; transverse series above lateral line with 10-13 scale rows and below with 5-9 scale rows. Dorsal fin with 11, pectoral fin with 13-16, pelvic fin with 7 or 8, anal fin with 24-30 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. 400.0 mm ( Graça, Pavanelli, 2007).

Distribution. Río Paraná and Uruguay basins.

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.