Label source: Tongue of a fish called Pirarucu, used for grating down sticks of Guarana. Pirarucu... is the monarch of the fishes of the Amazon and one of the finest fresh-water fishes in the world. When fully grown it measures 6 to 8 fett long, weighs f, rom 60 to 100 pounds and yields about one third that weight of dried fish. When fresh it is capital eating, although scarcely the equal of salmon, with the exception of the lower part of the belly....