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Uaru amphiacanthoides, also called Triangle Uaru, is a large South American cichlid valued for its tall body, understated coloration, and social behavior. Native to the blackwaters of the Amazon basin, it requires warm, soft, stable water and a spacious aquarium. This wild-collected species should be acclimated carefully and quarantined before introduction. Despite its adult size, it is generally peaceful when kept in a group with suitable tank mates. Its commercial rarity is rated 1 out of 3, meaning very common, although availability may vary between shipments. A plant-based diet and efficient filtration are essential for long-term success.

General species description

Uaru amphiacanthoides is a large Amazonian cichlid that usually lives in groups, especially when young. Its laterally compressed body and triangular outline explain its common name. As an adult, it becomes a substantial fish requiring a long, tall aquarium. Its behavior is generally calm, although it may defend a territory during spawning. Individuals often establish a flexible hierarchy and interact continuously with one another. Keeping a small group encourages natural behavior and reduces stress. Group living, warm water, and excellent water quality are the foundations of proper care. This species is wild collected; gradual acclimation, quarantine, and a varied diet are therefore especially advisable.

Geographic origin and biotope

The distribution of Uaru amphiacanthoides is associated with the Amazon basin, particularly the Rio Negro and its tributaries, with a presence reported in Colombia. It inhabits blackwater and seasonally flooded forest areas, where the water is stained by tannins released from leaves and decomposing wood. The natural environment is usually mineral-poor, acidic, and very warm. Roots, submerged branches, and leaf deposits provide shelter and grazing surfaces. In an aquarium, these conditions can be approximated with wood, suitable leaves, and subdued lighting. Soft, acidic, amber-colored water is especially suitable, although stable parameters are more important than maintaining extremely low pH.

Precise location and local name

For this profile, the reference locality is the Rio Negro basin in Colombia, in a blackwater and flooded-forest environment. The most commonly used local or trade name is Uaru; Triangle Uaru is mainly a vernacular name referring to the body shape. The term Uaru is used in several Amazonian regions for this type of cichlid. Common names may vary between communities, collectors, and countries. In the aquarium trade, the scientific name Uaru amphiacanthoides remains the most reliable way to identify the species and avoid confusion with Uaru fernandezyepezi.

Appearance and physical characteristics

The body of Uaru amphiacanthoides is tall, strongly compressed, and marked by an almost triangular outline. The base coloration ranges from grayish brown to olive beige, with a large dark area in the middle of the flank and another dark marking near the base of the caudal fin. The fins are generally grayish to brownish, while breeding fish may display stronger contrasts. Juveniles are often more heavily marked and can look quite different from adults. The mouth is adapted for grazing on plant material and small organisms. The dark lateral patch and triangular body shape are its most recognizable features. Under good conditions, the adult can reach about 30 cm.

General diet

Uaru amphiacanthoides is primarily herbivorous, with a natural diet consisting of algae, periphyton, plant debris, and small organisms associated with vegetation. In the aquarium, offer a daily diet rich in plant matter, including spirulina, vegetable wafers, zucchini, spinach, or other appropriately prepared foods. Quality pellets for large cichlids may supplement the diet but should not replace the vegetable component. Small amounts of frozen or protein-rich foods can be offered occasionally, especially to juveniles, but excess protein may contribute to digestive problems and water pollution. A predominantly plant-based diet, divided into several small meals, helps maintain good condition and limits competitive feeding behavior.

Essential data

• Native river: Rio Negro
• Local name: Uaru
• Origin of the scientific name: Uaru is the genus name; amphiacanthoides describes a morphological resemblance to spiny cichlids.
• Etymology of the full name: Uaru is an Amazonian vernacular name used for this fish; amphiacanthoides comes from the Greek amphi, meaning on both sides or around, akantha, meaning spine, and -oides, meaning resembling.
• Common/vernacular names: Triangle Uaru, Uaru
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: oo-ah-roo am-fee-ah-kan-thoy-deez
• Discovery: Jacques Pellegrin, 1904
• Maximum adult size: about 30 cm
• Water temperature and pH: 26 to 30 °C; pH 4.5 to 7.0
• Appearance of the waterway and surrounding vegetation: amber blackwater, tannins, flooded forest, roots, branches, and leaf litter
• Typical tank mates: Symphysodon aequifasciatus, Pterophyllum scalare, Geophagus altifrons, Satanoperca jurupari
• Temperament and behavior: generally peaceful and social; territoriality increases during spawning
• Water depth: quiet, sheltered areas of shallow to moderate depth
• Sexual dimorphism: difficult to identify outside spawning; the genital papilla may help with mature breeding fish
• Bottom structure and flow: sandy or muddy bottom covered with leaves, submerged wood, and slow to moderate current

In your aquarium

Success with Uaru amphiacanthoides depends mainly on available space, stable water, and proper nutrition. Provide a large aquarium, oversized filtration, and regular water changes while avoiding sudden temperature or pH fluctuations. Wood, roots, and shaded areas improve its comfort. Because this is a wild-collected species, quarantine and careful dietary transition deserve special attention. A stable group, plant-based foods, and warm water are the keys to maintaining this cichlid successfully over the long term.