This South American species is native to the Amazon, Essequibo and Oyapock basins.
It is absent from the Rio Negro basin, except the Branco River, which is inhabited by both silver and black arowanas.
The silver arowana occurs in both black- and whitewater habitats, including flooded forests.
This fish has relatively large scales, a long body, and a tapered tail, with the dorsal and anal fins extending all the way to the small caudal fin, with which they are nearly fused.
Its maximum total length is typically considered to be 0.9 m (3.0 ft), but there are reports of individuals up to 1.2 m (3.9 ft).
Unlike the black arowana, the silver arowana has the same coloring throughout its lifespan. Adults of the two species are very similar, but can be separated by meristics.
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