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Aequidens tetramerus (Andinoacara), also called Red Saddle, is a South American freshwater cichlid suited to aquarists who appreciate territorial and expressive fish. It is generally associated with the genus Andinoacara and is recognized by its sturdy body, bluish reflections and warmer dorsal coloration, especially in mature, well-conditioned specimens. Native to tropical waterways of South America, it requires stable water, efficient filtration and a layout providing shelter. This variety is offered as a wild-collected species and as an exclusive offering from Ton.Fish in Canada; its high rarity makes it an uncommon find for dedicated aquarists.

General species description

Aequidens tetramerus (Andinoacara) is a freshwater cichlid belonging to the family Cichlidae, generally placed in the genus Andinoacara. Its behavior combines some reserve with a strong territorial personality, especially when a pair forms or a spawning site is selected. It is better suited to a spacious aquarium than to a small community tank, since adults defend their area and may intimidate quieter fish. A structured layout with rocks, wood and open swimming areas helps reduce conflict. The species prefers clean, well-oxygenated water and consistent maintenance. Its commercial rarity, rated very rare, will appeal mainly to aquarists seeking a wild form rather than a commonly distributed variety. The available fish are wild collected and represent an exclusive Ton.Fish offer in Canada.

Geographic origin and biotope

The species is associated with tropical drainage systems in South America, including parts of Brazil and neighboring areas of the Amazon basin. It occurs in rivers, tributaries and marginal habitats where flow may range from slow to moderate. The biotope usually includes shaded banks, submerged roots, stone accumulations and a substrate of sand or small gravel. Vegetation may be dense along the banks, while the streambed remains more open in flowing areas. In the aquarium, this diversity should be reproduced rather than replaced with a uniform layout: several shelters and broken sight lines allow each fish to retreat. Tropical water at 24 to 28 °C, with soft to moderately mineralized conditions, is generally suitable for maintenance.

Precise location and local name

Aequidens tetramerus (Andinoacara) occurs in several South American river systems, but the collection location should be considered carefully because wild lots may come from different localities. In Brazil, the vernacular name acará is used for several native cichlids and does not always identify the species precisely. The English name Red Saddle refers to the warmer or reddish dorsal area visible in some individuals, although this color varies with age, sex, mood and maintenance conditions. To preserve the value of a wild strain, collection information should be kept with the lot and different populations should not be mixed. This precaution is especially relevant for a very rare species offered as an exclusive Canadian listing.

Appearance and physical characteristics

The body of Aequidens tetramerus (Andinoacara) is oval, laterally compressed and fairly deep, with a strong head and well-developed fins. The base color ranges from olive brown to bluish gray, with metallic reflections along the flanks. Dark markings may appear on the body, while the dorsal area can develop copper to reddish tones, giving rise to the name Red Saddle. The fins may display blue, yellow or orange shades, particularly when the fish is displaying or defending its territory. As with many cichlids, coloration can change quickly in response to stress and social interactions. Maximum adult size is approximately 15 cm, which still calls for a properly sized aquarium. Body shape and dorsal color intensity are the most distinctive features to observe.

General diet

In nature, Aequidens tetramerus (Andinoacara) uses food resources available on the bottom and in the water column. Its aquarium diet should therefore be varied and based mainly on quality cichlid pellets, supplemented with frozen foods such as brine shrimp, mysis or bloodworms. Small portions offered regularly support good condition without overloading the water. Vegetable foods may also be provided occasionally, including pellets containing algae or plant ingredients. Avoid live foods from questionable sources and excessively rich meals. A balanced diet supports dorsal coloration, growth and overall resistance. Juveniles should receive smaller foods and portions, while adults benefit from variety without overfeeding.

Essential data

• Native river:
• Local name used: Acará
• Origin of the scientific name: The species is currently associated with the genus Andinoacara; Aequidens tetramerus is a name used in aquarium and taxonomic literature.
• Etymology of the complete name: Andinoacara combines Andino, referring to the Andes, with acara, a South American term used for cichlids; tetramerus means four-parted or composed of four elements.
• Common/vernacular names: Red Saddle, acará
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: ay-kwi-dens tet-rah-MEE-rus
• Discovery: Johann Jakob Heckel, 1840
• Maximum adult size: About 15 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: Tropical waterways bordered by roots, rocks and riparian vegetation, with shaded areas.
• Typical tankmates: Acarichthys heckelii, Geophagus altifrons, Satanoperca jurupari
• Temperament and behavior: Territorial and generally cautious; becomes more defensive during breeding.
• Water depth: Shallow to moderately deep areas near banks and submerged structures.
• Sexual dimorphism: Mature males may become larger and develop more extended fins; distinction remains variable.
• Bottom structure and flow: Sand, gravel, rocks and woody debris; slow to moderate flow depending on the habitat.

In your aquarium

To successfully maintain Aequidens tetramerus (Andinoacara), provide a spacious, well-filtered aquarium arranged to create several territories. Sand or fine gravel, driftwood and stable rocks are suitable, as are sturdy plants protected from rearranged décor. Keep the water clean and stable, avoid overcrowding and offer a varied diet. Wild fish should receive careful acclimation and quarantine whenever possible. Pay particular attention to signs of stress and repeated chasing. With an organized layout, consistent water quality and tankmates of comparable size, this very rare species can become an impressive cichlid in a suitable aquarium.