Hydrolycus armatus is a species of dogtooth characin found in freshwater of tropical South America. It is sometimes known as the payara,a name it shares with the related H. scomberoides.
This predatory fish occasionally makes its way into the aquarium trade, but it requires a very large tank.
Uaru amphiacanthoides, the Uaru or Triangle cichlid, is a species of cichlid native to South America where it occurs in clear streams of the Amazon Basin. This species can reach a length of 25 centimetres (9.8 in) SL. It is also of importance as a food fish for native peoples and can be found in the aquarium trade.