Arapaima genus_authority = M�ller, 1843 species = A. gigas binomial = Arapaima gigas binomial_authority = (Schinz (Heinrich Rudolf Schinz), 1822)

The arapaima, pirarucu, or paiche (Arapaima gigas) is a South American tropical freshwater (fresh water) fish. It is a living fossil and one of the largest freshwater fishes (freshwater fish) in the world.