Gymnotus paraguensis Albert, Crampton, 2003

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 : 57

Gymnotus paraguensis Albert, Crampton, 2003

Fig. 16

Body elongated and compressed; greatest depth contained 9.7 to 10.2 times in TL; head length 7.5 to 8.2, anal-fin base length 1.2 in LEA; snout length 2.8 to 3.0, horizontal orbital diameter 13.9 to 15.4 and least interorbital width 2.4 to 3.2 in HL. Mouth superior, dentary prognathous. Pectoral fin with 17-21 rays and anal fin with 260-270 rays; transverse series above lateral line with 11 or 12 scale rows. Ground color dark-brown; body with 23-26 light-beige oblique stripes, with well-defined margins; two to seven inverted Y-shaped stripes, or sometimes X-shaped, or sometimes interrupted on porterior half of body. Hyaline fins or light-beige, with scattered dark-brown spots ( Graça, Pavanelli, 2007).

Maximum total length. 280.0 mm ( Graça, Pavanelli, 2007).

Distribution. Paraná-Paraguay system.

Remarks. Gymnotus paraguensis is a non-native species 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.

Figures

Fig. 16. a. Apteronotus acidops, NUP 1750, 240.0 mm TL, Itaipu Reservoir, Guaíra, State of Paraná. b. Apteronotus aff. albifrons, 100.0 mm TL, uncat. c. Apteronotus cf. caudimaculosus, 260.0 mm TL, uncat. d. Apteronotus ellisi, 128.2 mm TL, uncat. e. Sternarchorhynchus britskii, 212.0 mm TL, uncat. f. Gymnotus inaequilabiatus, 238.0 mm TL, uncat. g. Gymnotus pantanal, NUP 13328, 138.6 mm SL, ribeirão Jacutinga, São Jorge do Ivaí, State of Paraná. h. Gymnotus paraguensis, 250.0 mm TL, uncat. i. Gymnotus sylvius, MZUSP 83538, paratype, 260.0 mm TL, rio Ribeira de Iguape, next to Miracatu, Miracatu, State of São Paulo.