Rhamphichthys hahni (Meinken, 1937)

Fig. 17

Body elongated and compressed; greatest depth contained 6.4 to 9.1 times in TL; head length 6.2 to 7.1, anal-fin base length 1.2, caudal-peduncle length 10.0 to 13.3 in LEA; snout length 1.9 to 2.1, horizontal orbital diameter 20.0 to 23.0 and least interorbital width 6.1 to 7.0 in HL. Mouth terminal; long snout. Pectoral fin with 17-20 rays and anal fin with 337-400 rays; transverse series above lateral line with 20-22 scale rows. Ground color pale brown; darkbrown transverse and irregular bars and blotches. Fins with dark-brown spots, sometimes forming longitudinal irregular stripes (Graça, Pavanelli, 2007).

Maximum total length. 800.0 mm (Graça, Pavanelli, 2007).

Distribution. Rio Paraná basin.

Remarks. Rhamphichthys hahni has been recently captured in the upper rio Paraná floodplain, with no anterior records in the basin. Therefore, this species is considered as nonnative from the upper rio Paraná, and its occurrence in the region can be associated with its introduction as a live bait by anglers, or with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.