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A large South American freshwater food fish (Arapaima gigas) that can attain a length of up to 3 meters (10 feet). Also called pirarucu.

[American Spanish or Portuguese, both probably of Tupian origin.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) a very large primitive freshwater teleost fish, Arapaima gigas, that occurs in tropical South America and can attain a length of 4.5 m (15 ft) and a weight of 200 kg (440 lbs): family Osteoglossidae
[via Portuguese from Tupi]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Pirarucu Arapaima gigas (Osteoglossomorpha: Osteoglossidae) is a large carnivorous fish species of high commercial value and great aquaculture potential in the Amazon region.
Among the species most exploited and consumed by the regional population, the pirarucu Arapaima gigas (Schinz 1822), known as Amazon cod, is highly valued in the market, especially when its meat is marketed dried and preserved with salt.
The absence of mortality during transportation found in this study was also recorded for pirarucu (Arapaima gigas), but with a shorter transportation time of 3 hours (Brandao, Gomes, Crescencio, & Carvalho, 2008).
Arapaima gigas (Schinz, 1822) (Osteichthyes: Arapaimidae) is the world's largest scale fish, may reach 3 m length, presents wide geographical distribution in the Amazonian region and occurs in the floodplain of the rivers Araguaia-Tocantins, Solimoes-Amazonas and their effluents, Amazonas river in the Peruvian Andes, tributaries of the river systems Essequibo and Rupununi the Guiana (Imbiriba, 2001).
Measurements of net ion fluxes provide a good correlation with stress of transport in Arapaima gigas (pirarucu) (GOMES et al., 2006), Carnegiella strigata (marbled hatchetfish), Paracheirodon axelrodi (cardinal tetra) (GOMES et al., 2008; 2009) and silver catfish (PARODI et al., 2014).
This time I fly fished the Rewa River, famed for the arapaima (arapaima gigas), out of a fly fishing-only lodge set up by the Costa del Mar sunglasses company (https:// and other parties.
Pirarucu, Arapaima gigas (Shinz 1822), is the largest Amazonian and freshwater fish with scales in the world.
Noteworthy Catches--This arapaima (Arapaima gigas), also called pirarucu, was caught by Alan Atkins, well known carp angler, while fishing at Gillhams Fishing Resort in Krabi, Thailand.