Angelfish

Angelfish are recognized by their distinctive disc-shaped bodies and long, flowing fins, giving them a triangular profile. They possess a high, compressed body with elongated dorsal and anal fins, and often have long, streamer-like ventral fins. Coloration varies widely due to selective breeding, with wild types typically having silver bodies with dark vertical stripes. Captive-bred varieties include marbled, black, koi, and albino forms. The fish in the image appears to be a black marbled or patterned variety.

Native to the Amazon Basin in South America, specifically in Peru, Colombia, and Brazil, they inhabit slow-moving, clear waters among dense vegetation and submerged roots. They prefer areas with plenty of hiding spots.

Angelfish are generally omnivorous, feeding on small invertebrates, insect larvae, and plant matter in their natural habitat. They play a role in their ecosystem as mid-level consumers, helping to control insect populations and serving as a food source for larger predators. In the aquarium trade, they are popular ornamental fish. Their conservation status is 'Least Concern' according to the IUCN Red List due to their wide distribution and stable populations.

Other species in the genus Pterophyllum, such as Pterophyllum altum (Altum Angelfish) and Pterophyllum leopoldi (Leopold's Angelfish), are similar. Altum Angelfish are generally larger and have a more elongated snout and pronounced dorsal/anal fin rays, giving them a more 'aristocratic' appearance. Leopold's Angelfish are smaller with a more rounded body shape and a distinct black spot on the dorsal fin. There are also many different color morphs and strains of Pterophyllum scalare that can look quite different from each other.