Pterophyllum scalare

A Little More Information...

Pterophyllum scalare, also sold under the common name Turkish Emerald Green, is a captive-bred variety of the famous freshwater angelfish. Its triangular profile, elongated fins, and calm movements make it a centerpiece of Amazonian-style aquariums. This form generally highlights emerald-green reflections and a dark or metallic coloration, depending on the bloodline. Like all angelfish, it remains a territorial cichlid, especially when a pair forms and spawning begins. It requires warm, stable, well-maintained water and a tank tall enough for its vertical fins. Its availability is generally common in the aquarium trade.

General species description

Pterophyllum scalare belongs to the South American freshwater angelfish group, cichlids adapted to calm, plant-rich waters. Its laterally compressed body and highly developed fins help it move among roots and aquatic plants. In an aquarium, it is usually peaceful with appropriately sized tankmates, but it may defend a territory and chase very small fish. Juveniles often live in groups; adults establish a hierarchy and may eventually form a lasting pair. A tall aquarium, gentle filtration, and broken lines of sight encourage natural behavior. The Turkish Emerald Green is a captive-selected form, not a separate geographic population. It nevertheless retains the species’ basic needs, including warm, soft to moderately acidic water and excellent parameter stability.

Geographic origin and biotope

Reference countries: Brazil, Peru, and Colombia, within the Amazon Basin. The species inhabits quiet sections of major rivers, backwaters, flooded margins, and temporarily inundated areas. The habitat is often shaded by riparian forest, with roots, branches, leaf litter, and abundant aquatic or marginal vegetation. Water may be clear, amber-colored, or lightly stained with tannins, depending on the region. Flow is generally slow to moderate, without constant turbulence. In an aquarium, vertical plants, roots, and open swimming areas reproduce this structure better than a completely bare layout. Practical values are around 24 to 30 °C and a pH of approximately 6.0 to 7.5, with stability being more important than one exact value.

Specific locality and local name

The name Turkish Emerald Green refers to a commercial line of Pterophyllum scalare and does not identify one specific collection locality. The nominal species is widely distributed throughout the Amazon Basin, where Brazilian names such as acará-bandeira and peixe-anjo are used. Wild populations may differ in shade, body shape, and pattern according to their drainage; these traits cannot automatically assign a captive variety to one river. In practice, the name mainly describes a color form sought by aquarists, with green, blue, or metallic tones. It is therefore important to distinguish the variety name from the species’ actual geographic origin.

Appearance and physical characteristics

Pterophyllum scalare has a tall, thin, strongly compressed body, a sloping forehead, long dorsal and anal fins, and filamentous pelvic fins. Total height, including the fins, may approach 25 cm, while the body alone commonly reaches about 15 cm in large adults. The Turkish Emerald Green form is recognized mainly by its emerald-green reflections, sometimes combined with blue, gray, or brown depending on lighting and bloodline. Vertical bars may be visible or subdued, and color intensity changes with mood, surroundings, and water quality. As with other angelfish, intact, fully extended fins are a useful indicator of good health.

General diet

In the wild, Pterophyllum scalare eats small aquatic invertebrates, larvae, crustaceans, small fish, and various prey found among vegetation. In aquariums, it readily accepts quality dry foods, but its diet should be varied. Suitable cichlid pellets, frozen foods such as mosquito larvae and brine shrimp, and carefully sourced live foods can be rotated. Meals should remain moderate to prevent water pollution and excessive weight gain. A varied diet supports growth and coloration without turning the species into a specialized predator. Small tankmates must be monitored because an adult angelfish can swallow any fish small enough to fit in its mouth. The priority is a **varied diet** and consistently good water quality.

Essential data

• Name of river of origin: Amazon Basin; no single river applies to the commercial variety.
• Local name used: Acará-bandeira; peixe-anjo.
• Origin of the scientific name: Name established by Martin Hinrich Carl Lichtenstein.
• Etymology of the complete name: Pterophyllum means “winged leaf” or “feather-shaped leaf”; scalare refers to a ladder, in reference to the bands and body shape.
• Common/vernacular names: Freshwater angelfish, angelfish, Turkish Emerald Green.
• Family: Cichlidae.
• Subfamily: Cichlinae.
• Name pronunciation: terr-oh-FILL-um skah-LAH-reh
• Discovery: Martin Hinrich Carl Lichtenstein, 1823.
• Maximum adult size: About 15 cm body length; up to approximately 25 cm in height including the fins.
• Water temperature and pH: 24 to 30 °C; pH 6.0 to 7.5.
• Watercourse appearance and surrounding vegetation: Calm, shaded water bordered by roots, branches, leaf litter, and dense vegetation.
• Typical tankmates: Similar-sized angelfish, peaceful appropriately sized catfish, calm dwarf cichlids, adult-sized tetras, peaceful surface fish, and non-aggressive loricariids.
• Temperament and behavior: Generally peaceful, schooling when young, territorial as a pair, and protective during breeding.
• Water depth: Calm areas, often shallow to moderately deep, near roots and vegetation.
• Sexual dimorphism: Difficult to determine outside breeding; the genital papilla becomes more visible in a breeding pair.
• Bottom structure and flow: Sandy-muddy bottom or leaf litter with roots; slow to moderate current.

In your aquarium

To succeed with Pterophyllum scalare, choose a tall, spacious aquarium, especially for a group of juveniles that will need to establish a hierarchy. Keep the water warm, clean, and stable, with moderate flow, sturdy plants, and roots that create visual barriers. Avoid tiny, fin-nipping, or highly boisterous tankmates. A varied diet, regular water changes, and close observation of the fins and breathing support good longevity. Breeding may increase territorial behavior, so provide separate areas and enough vertical surfaces. With these precautions, this green form remains a **spectacular ornamental fish** and a relatively accessible choice.