FaunaHub

Angelfish (Pterophyllum scalare)

FishFreshwaterAquarium

A freshwater angelfish (Pterophyllum scalare) with tall triangular fins.

Freshwater angelfish (Pterophyllum scalare).

Image: James St. John, CC BY 2.0, via Wikimedia Commons.

Overview

The freshwater angelfish (Pterophyllum scalare) is a popular aquarium cichlid from South America, recognised by its tall, triangular body and long, trailing fins. It should not be confused with the marine angelfishes, which are an unrelated group. Freshwater angelfish are graceful and long-finned, and they are a step up in care from the smallest beginner fish because of their size and temperament.

Habitat & Range

Wild freshwater angelfish live in the slow-moving, often densely vegetated waters of the Amazon basin and other parts of tropical South America, where their tall, narrow shape helps them move among plants and roots. In aquariums they are tropical fish that need a heated, filtered, and tall tank to accommodate their fin height. Released aquarium fish can harm local ecosystems and should never be put into the wild.

Diet

Angelfish are omnivores that lean carnivorous, feeding in the wild on small invertebrates and other small prey along with plant material. In aquariums they are given prepared foods suited to their needs. This page does not give feeding quantities; appropriate diet and amounts depend on the individual fish and should follow qualified aquarium guidance.

Behavior

Angelfish are cichlids and can be territorial, particularly when breeding, when a pair may defend a chosen site. They can be kept with compatible tank mates, but very small fish may be seen as food, so stocking choices need care. They are intelligent and can become familiar with their keepers. As with all fish, behaviour depends on tank size, layout, and water quality.

Human Interaction & Conservation

Angelfish have been bred into many colour and fin varieties and are a mainstay of the freshwater aquarium hobby. They are aquarium animals, not wildlife; releasing them is harmful. Responsible keeping means a suitably sized, heated, well-maintained aquarium, careful tank-mate selection, and qualified help if a fish appears unwell. This profile is educational and not a substitute for aquarium-care or veterinary advice.

Appearance & Recognition

The freshwater angelfish has a distinctive disc-shaped, laterally compressed body with greatly extended dorsal and anal fins and long, trailing pelvic fins, giving a tall, arrowhead profile. The wild form is silver with dark vertical bars that can fade or intensify with mood, but selective breeding has produced marble, gold, black, and other patterns. This shape is quite different from the rounded marine angelfishes.

Similar Animals

Freshwater angelfish are cichlids, the same broad family as many other aquarium and wild fish. The name "angelfish" is also used for unrelated marine reef fish, so the two should not be confused. Among FaunaHub's aquarium profiles, tetras are common, peaceful tank-mates often kept in community aquariums.

Freshwater aquarium basics →Aquarium care hub →

More photos of the angelfish

A silver-and-black striped freshwater angelfish in a planted aquarium.

A freshwater angelfish in a planted aquarium.

Image: Emőke Dénes, CC BY-SA 4.0, via Wikimedia Commons.

Frequently Asked Questions — Angelfish

Is the freshwater angelfish the same as a marine angelfish?
No. The freshwater angelfish (Pterophyllum scalare) is a South American cichlid. The colourful marine or saltwater angelfishes are an unrelated reef-fish family. They share a common name but are very different fish with different care.
Are angelfish good for beginners?
Angelfish are popular but are generally considered a step beyond the easiest beginner fish, because of their size, tall fins, and cichlid temperament. They need a suitably tall, well-maintained tank and careful tank-mate choices. Research and qualified guidance help avoid problems.
Why do angelfish become aggressive sometimes?
As cichlids, angelfish can be territorial, especially when forming pairs or breeding, when they may defend a site. Aggression is influenced by tank size, layout, and stocking. Thoughtful aquarium planning reduces conflict.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.