Mexican tetra

Uso

Uso a nivel regional (Orinoquia): consumo (Lasso et al. 2011)

Peces de la cuenca del río Pauto, Orinoquia colombiana

distribution

The type locality of A. rutilus is in the Río Paraná, whereas Astyanax fasciatus was primarily described from the Rio São Francisco basin in Brazil, but subsequently cited for most basins from Mexico to central Argentina. Melo & Buckup (2006) restricted Astyanax fasciatus to the Rio São Francisco basin, leaving most other populations as A. aff. fasciatus. They said that A. rutilus is probably a valid species and mentioned some differences in the number of vertebrae, supporting that idea. Also, Melo & Buckup (2006: fig. 5) showed a male specimen of A. fasciatus having an elongation of the dorsal fin that was neither observed by us nor mentioned in any population of Astyanax living in Argentina. Therefore, since that paper, specimens from Argentina once identified as A. fasciatus are named A. rutilus by most authors. Protogino et al. (2006) described Astyanax aramburui, which distinguishes from A. rutilus mainly by the presence of bony hooks in all fins of males. At least until a revision of the A. fasciatus complex might be conducted, we assume that the specimens from Argentina and Uruguay once identified as A. fasciatus are either A. aramburui or A. rutilus.

On some species of Astyanax reported erroneously from Argentina.

description

Body elongated; greatest depth contained 2.9 to 3.4 and caudal peduncle depth 10.4 to 11.1 times in SL; head length 4.5 to 4.6, predorsal distance 2.0 to 2.1 and caudal peduncle length 9.5 to 13.3 in SL; snout length 3.4 to 3.6, horizontal orbital diameter 2.2 to 2.3 and least interorbital width 3.3 to 3.5 in HL. Mouth terminal; inner row of premaxilla with 5 teeth, outer with 4 or 5, dentary with 10 - 12, and maxilla with one tooth. Lateral line complete, with 34 - 36 pored scales; transverse series above lateral line with 5 or 5 ½ scale rows and below with 5 scale rows. Dorsal fin with 11, pectoral fin with 15, pelvic fin with 9, anal fin with 24 - 28, and caudal fin with 19 rays. Ground color silvery; black vertically elongated humeral blotch; silvery longitudinal band on flank (black in fixed specimens), from humeral blotch to median caudal-fin rays, larger on caudal peduncle, forming oval-shaped, horizontally elongated, blotch. Unpaired fins reddish, paired fins hyaline (Graça, Pavanelli, 2007). Maximum standard length. 102.0 mm (Graça, Pavanelli, 2007).

Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated

materials_examined

ILPLA 596, (6) 54.2 - 63.5 mm SL, Laguna de Lobos (35 ° 17 ’ S 59 ° 07 ’ W), Buenos Aires Province, Argentina, coll.: A. Miquelarena et al, June 1986.

A new species of Astyanax (Teleostei, Characiformes, Characidae), with breeding tubercles, from the Paraná and Uruguay river basins.