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Andinoacara rivulatus, also known as the Green Terror, is a South American cichlid appreciated for its colors and assertive behavior. Native to waterways in western Ecuador and northwestern Peru, it is recognized by its iridescent blue-green scales, orange-edged fins, and robust body. Despite its dramatic name, its aggression varies with available space, décor, and pair formation. This is a fish for a spacious aquarium, with efficient filtration, shelters, and carefully selected tank mates. The species remains fairly common in the aquarium trade. Its territorial behavior and breeding activity make it especially interesting for aquarists who enjoy observing the social dynamics of large cichlids.

General species description

Andinoacara rivulatus is a medium to large cichlid known for its vivid coloration and intelligent behavior. It spends much of its time in the lower and middle areas of the aquarium, inspecting the décor, defending a territory, and reacting quickly to nearby movement. Its personality may be relatively calm when kept alone or with suitable fish, but it becomes much more assertive during breeding. A pair may then defend a large area and drive away intruders considerably larger than themselves. For this reason, it is better suited to a regional aquarium or a setup for large cichlids than to a traditional community tank. A volume of at least 300 litres for one fish, with more space for a pair or community, makes territorial management easier. The species appreciates clean, well-oxygenated water and regular water changes. Its commercial rarity is generally considered fairly common.

Geographical origin and biotope

Andinoacara rivulatus comes from the Pacific slope of South America, mainly western Ecuador and northwestern Peru. It inhabits rivers and tributaries subject to seasonal changes in flow, as well as quieter areas near the banks. Water may be clear or slightly tinted, with variable mineral content and good oxygen availability. Habitats include areas sheltered by roots, branches, stones, and sometimes dense riparian vegetation. Depth varies by location, but the species often uses margins and shallow shelves rather than very deep areas. In aquariums, a temperature of 22 to 28 °C and a pH around 6.5 to 8.0 are generally suitable. Native waterways have bottoms of sand, gravel, and stones, with moderate to strong flow depending on the season. Reference countries: Ecuador and Peru.

Precise locality and local name

The natural range of Andinoacara rivulatus covers several Pacific coastal basins, including river systems in western Ecuador and northwestern Peru. Geographic references commonly associated with the species include the Esmeraldas and Guayas basins, along with coastal waterways of northern Peru. In markets and Spanish-speaking communities, it may be called terror verde, vieja, or acara, depending on the region. These vernacular names are not always exclusive to this species and may also be used for other cichlids. In the aquarium trade, Green Terror is the most common English name. The exact origin of a store fish depends on its breeding source and commercial lineage. To reproduce its natural behavior, it is helpful to provide a habitat resembling a rocky bank with roots and shelters. Such a layout also helps reduce direct visual contact between territorial fish.

Appearance and physical characteristics

Andinoacara rivulatus has an oval, laterally compressed body, a heavy head, and elongated dorsal and anal fins in adults. Its base color ranges from blue-green to turquoise, with strong metallic reflections on the head and flanks. The fins usually have an orange or reddish edge, especially in healthy, well-conditioned specimens. A dark line and blue markings may appear on the cheek and operculum. Adult males are often larger and develop longer fins, while females may retain a more compact body; these differences vary with age and strain. The species can reach about 20 cm standard length, with a greater total length when the fins are fully extended. Color variations in the trade do not necessarily represent different species. Stable water, varied food, and a non-abrasive layout help maintain its iridescent scales and natural body condition.

General diet

Andinoacara rivulatus is an omnivore with a carnivorous tendency and readily accepts a varied aquarium diet. A quality pellet for large cichlids can form the staple, supplemented with frozen foods such as shrimp, krill, bloodworms, and small crustaceans. It can also benefit from plant matter provided through spirulina or algae-containing preparations. Juveniles should receive small regular portions, while adults should be fed moderately to prevent obesity and water-quality problems. A varied diet supports growth, coloration, and vitality, but goldfish and other fatty feeder fish are unsuitable as regular food. Live prey may stimulate hunting behavior, but it carries disease risks and is not essential. Remove uneaten food quickly, as this cichlid may stir the substrate while foraging. Measured meals combined with efficient filtration help maintain good water quality and reduce the impact of its active feeding behavior.

Essential data

• Native river name: Esmeraldas, Guayas, and other Pacific coastal river basins
• Local name used: Terror verde, vieja, acara
• Origin of the scientific name: Andinoacara refers to the Andes and the name acara; rivulatus comes from the Latin rivulus, meaning small stream
• Etymology of the full name: Andinoacara = Andean acara; rivulatus = marked with small grooves or associated with small streams
• Common/vernacular names: Green Terror, terreur verte, terror verde
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: an-dee-noh-AK-ah - ree-voo-LAH-tus
• Discovery: Albert Karl Ludwig Gotthilf Günther, 1860
• Maximum adult size: About 20 cm standard length
• Water temperature and pH: 22 to 28 °C; pH 6.5 to 8.0
• Appearance of the waterway and surrounding vegetation: Banks with roots, branches, stones, and riparian vegetation; clear to slightly tinted water
• Typical tank mates: Large robust cichlids, large peaceful catfish, suitably sized loricariids, adult armored catfish
• Temperament and behavior: Territorial, substrate-digging, and generally assertive; more aggressive as a pair and during breeding
• Water depth: Marginal areas, shallow shelves, and shallow to moderately deep sections
• Sexual dimorphism: Males are often larger, with more extended dorsal and anal fins; juveniles can be difficult to sex
• Bottom structure and flow: Sand, gravel, and stones; moderate to strong flow depending on location and season

In your aquarium

Success with Andinoacara rivulatus depends mainly on providing space, oversized filtration, and décor that divides the territory visually. Roots, firmly placed stones, and shelters allow each fish to retreat, while sand or fine gravel reduces injuries during digging. Watch tank mates closely, particularly after a pair forms. Regular water changes, stable temperature, and varied food support healthy growth. With these precautions, this cichlid offers expressive behavior and striking coloration without becoming unnecessarily difficult. The main priorities are available swimming space, water quality, and thoughtful compatibility. A carefully planned aquarium gives the fish room to establish a territory while reducing continuous conflict with its companions.