Notes: There are only two species: the Black arowana, Osteoglossum ferreirai, which comes from the Rio Negro and its tributaries in Brazil, and the Silver arowana, O. bicirrhosum, which is more ...
South America is home to two species; the Silver arowana (Osteoglossum bicirrhosum) and the lesser-seen Black arowana (Osteoglossum ferreirai). In juveniles, the differences are quite apparent; one ...