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 Platanichthys platana (Regan, 1917) Fig. 2 Body elongated, laterally compressed; greatest body depth contained 3.8 to 4.5 and caudal peduncle depth 9.0 to 11.5 times in SL; head length 3.5 to 3.8, predorsal distance 2.0 to 2.1 and caudal peduncle length 8.5 to 12.3 in SL; snout length 4.2 to 5.6, horizontal orbital diameter 2.5 to 2.9 and least interorbital width 5.1 to 7.3 in HL. Mouth superior; anterior supra-maxilla small or absent; posterior frontal fontanel retained in adults. Dorsal fin with 14 rays, pectoral fin with 11 or 12 rays, pelvic fin with 7 rays, anal fin with 18-20 rays, and caudal fin with 19 rays. Ground color whitish. Maximum standard length. 32.6 mm . Biological data. Feeds on filamentous algae, debris, eggs, larvae of chironomids and bivalves, and zooplankton ( Aguiaro et al. , 2003 ). Distribution. Lagoons, estuaries and lower parts of rivers in Argentina , Brazil and Uruguay . Remarks. Platanichthys platana , described from the río de la Plata, was already reported in the upper rio Paraná basin by Langeani et al. (2007) , but this is the first record in the upper rio Paraná floodplain, where it has been captured since 2013. Therefore, P. platana is considered a non-native species from the upper rio Paraná basin, and its occurrence can be associated with the functioning of the Canal da Piracema, a fish ladder that connects the river downstream from the Itaipu Dam to the lake upstream from the dam. The maximum size observed herein was 32.6 mm SL, much less than the 70.0 mm SL reported by Whitehead (1968) .