The biara (Rhaphiodon vulpinus) is a South American piscivorous fish in the dogtooth characin family.

It belongs to the monotypic genus Rhaphiodon, although some minor differences in morphometrics and colour are known from across its large range.

[2][3] It is found in the Amazon, Orinoco, and Río de la Plata Basins, as well as rivers of the Guianas.

[4] It occurs in a wide range of freshwater habitats such as main river channels, flooded forests, lakes and reservoirs.

[4] Although it reportedly can reach up to 80 cm (2 ft 7 in) in standard length,[4] the largest confirmed were 63-64 cm (about 2 ft 1 in)[6][7] Like other dogtooth characins, the biara has very long pointed canine teeth, but it is easily separated from its relatives by its very elongated and streamlined body shape.