Blue Arawana (Osteoglossum Ferreirai)
This curious fish lives mainly on the surface, it belongs to the family of Arapaima or Pirarucu (Osteoglossidae).
Its shape draws the attention of any observer. Its body is compressed covered with large scales; the caudal fin is relatively small. The dorsal and anal fins complete the different dimensions of the fin to form a set of very effective propulsion.
Leaded-gray and silver color is the tone of common arawana (O. Bicirrohsum) is much clearer than the black arawana (reported in the Black and Tomo rivers), O. Ferreirae, which can be described as blue dark on the back and silvery gray with greenish tones on the sides. They are found in rivers, lakes or sandy bottom pipes.