Angelfish

Pterophyllum is a small genus of freshwater fish from the family Cichlidae known to most aquarists as angelfish. All Pterophyllum species originate in the Amazon Basin, Orinoco Basin and various rivers in the Guiana Shield in tropical South America. The three species of Pterophyllum are unusually shaped for cichlids, being greatly laterally compressed, with round bodies and elongated triangular dorsal and anal fins.

This body shape allows them to hide among roots and plants, often on a vertical surface.
Naturally occurring angelfish are frequently striped transversely, colouration which provides additional camouflage.
Angelfish are ambush predators and prey on small fish and macroinvertebrates.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 3.0