Arapaima gigas (pirarucu) river monsters

Arapaima gigas the largest freshwater fish, also known as pirarucu, is a species of arapaima native to the basin of the Amazon River. Originally believed to be the sole species in the genus, it is among the largest freshwater fish.

This species is known for its primitive lung, also known as an obligate air-breather and which requires it to come to the surface regularly to gulp air. A unique feature is its tongue, which is bony or toothed. Arapaima are listed as endangered fishes according to the Convention on International Trade of Endangered Species, or CITES.

Arapaima gigas feeding?

Arapaima are carnivores, a top predator that primarily eats other fish. In captivity, they can be fed on chopped up meaty foods, crustaceans, pellets, and prepared foods such as krill and plankton.

Predatory and may attack even larger fish so tankmates should be chosen with care! Best to be kept small groups.