[Photo] Arapaima depicted on a 1954 postage stamp of British Guiana. British Guiana 72c stamp of 1954, scanned January 2006 by User:Stan Shebs http://commons.wikimedia.org/wiki/User:Stan_Shebs

The pirarucu (Arapaima gigas) is a species of arapaima native to the basin of the Amazon River. It is among the largest freshwater fish. Arapaima gigas is an obligate air-breather and needs to come to the surface regularly to gulp air.

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