Pterophyllum scalare

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Pterophyllum scalare is the well-known freshwater angelfish, a classic aquarium species kept by hobbyists for generations. Native to the Amazon Basin, this cichlid is recognized by its laterally compressed body, very long fins, and vertical bands that help it blend among roots and vegetation. Despite its elegant appearance, it becomes territorial, especially when a pair forms. Very common in the aquarium trade, it is available in many captive-bred varieties, although the natural form retains a restrained appearance that reflects its habitat and adaptations.

General species description

Pterophyllum scalare is an Amazonian cichlid that is usually peaceful in a spacious aquarium, although adults become more assertive during pairing and spawning. Young fish benefit from living in a small group; as they mature, pairs form and defend a territory, particularly against other angelfish. Its tall, laterally compressed body allows it to move among roots and upright plants. A sufficiently tall aquarium is important because much of its space is used vertically. The wild-type form is generally silvery, with dark vertical bands. Very common in the hobby, it is sold in many captive-bred varieties.

Geographic origin and biotope

Countries of reference: Brazil, Colombia, and Peru, within the Amazon Basin. Pterophyllum scalare inhabits quiet areas of major rivers, side channels, lagoons, and seasonally flooded forest. Depending on the region, the water may be clear, amber-colored, or lightly stained by organic matter. Flow is usually slow, and the habitat contains roots, submerged branches, and dense vegetation. These environments provide vertical shelter, which helps explain the species’ distinctive body shape. In an aquarium, moderate lighting and a structured layout encourage more natural behavior.

Precise location and local name

The species is broadly distributed through the Amazon Basin and its tributaries, including areas of the Brazilian Amazon and neighboring drainage systems. In Brazil, it is commonly called acará-bandeira, a name referring to its tall body and extended fins. The English name freshwater angelfish is widely used. Wild populations may differ in color and pattern according to their region. Fish sold in stores, however, are often identified by a commercial variety name rather than by a precise collection locality.

Appearance and physical characteristics

Pterophyllum scalare has a strongly compressed and unusually tall body. The elongated dorsal and anal fins emphasize its triangular profile, while the pelvic fins form long filaments. The wild-type form has a silvery to gray background and usually four vertical bands, including one through the eye and another on the caudal peduncle. The fins may show yellowish or reddish tones. Adults reach about 15 cm in body length, while total height including the fins may exceed 25 cm. This body shape calls for a tall, covered aquarium and tankmates too large to be swallowed.

General diet

Omnivorous with a carnivorous tendency, Pterophyllum scalare readily accepts quality prepared foods. A base of suitable cichlid pellets, supplemented with frozen foods such as brine shrimp, mysis, or mosquito larvae, works well. Young fish should receive small, frequent meals to support growth. The diet should be varied, but live or frozen foods should not completely replace a balanced staple food. Because the species readily captures small prey, very small fish may be eaten. Controlled feeding helps prevent overfeeding and the resulting decline in water quality.

Essential data

• River of origin: Amazon River and tributaries
• Local name used: Acará-bandeira
• Origin of the scientific name: A name created to describe the species’ tall shape and fins
• Etymology of the full name: Pterophyllum means fin-leaf; scalare means ladder-like, referring to the vertical bands
• Common/vernacular names: Freshwater angelfish, angelfish, scalaire
• Family: Cichlidae
• Subfamily: Cichlinae
• Pronunciation: ter-oh-FIL-um - ska-LA-reh
• Discovery: Johann Jakob Heckel, 1840
• Maximum adult size: About 15 cm body length; approximately 25 to 30 cm tall including the fins
• Water temperature and pH: 24 to 30 °C; pH 6.0 to 7.5
• Appearance of the watercourse and surrounding vegetation: Quiet water, roots, submerged branches, leaf litter, and flooded-forest vegetation
• Typical tankmates: Paracheirodon axelrodi, Hemigrammus rhodostomus, Symphysodon aequifasciatus
• Temperament and behavior: Generally peaceful, schooling when young, territorial as a pair, and predatory toward very small fish
• Water depth: Quiet, shallow to moderately deep areas, often near vegetated margins and flooded zones
• Sexual dimorphism: Difficult to determine outside spawning; the genital papilla is the best indicator in adults ready to spawn
• Bottom structure and flow: Muddy or sandy bottom with plant debris, roots, and branches; slow to moderate flow

For greater success

To keep Pterophyllum scalare successfully, choose a tall, well-filtered aquarium furnished with roots, sturdy plants, and open swimming areas. Maintain warm, clean, stable water and offer a varied diet in controlled portions. A group of juveniles often allows pairs to form naturally, but adults may become territorial. Avoid tiny tankmates and fin-nipping species. Adequate aquarium height, consistent water quality, and thoughtful community planning are the main keys to keeping healthy freshwater angelfish.