Apistogramma erythrura

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Apistogramma erythrura is a small South American cichlid valued for its modest size and distinctive red tail. Native to the Rio Mamoré in Brazil, it inhabits warm, slow-moving waters where leaves, roots, and plant debris provide shelter. Its territorial behavior is most noticeable in males and during breeding. This species, collected from the wild, remains relatively uncommon in the aquarium trade, making it an appealing choice for aquarists interested in Apistogramma with a precise geographic origin. It is available exclusively from Ton.Fish in Canada.

General species description

Apistogramma erythrura is a dwarf cichlid of the genus Apistogramma, adapted to slow sections of small Amazonian waterways. As with several related species, the adult male is generally larger and more colorful than the female. Its aquarium appeal comes from its compact size, nuanced social interactions, and cave-spawning behavior. A rarity level of 2 indicates a species that is less common in the trade than the most popular apistogrammas. It is best suited to a mature aquarium with dense structure and stable water conditions. Behavior may become territorial during spawning, especially around a shelter occupied by a female. The specimens offered here are wild-collected, so gradual acclimation and highly palatable foods are important during the first days in captivity.

Geographic origin and biotope

The species comes from the Rio Mamoré basin in Brazil, within the upper drainage system associated with the Madeira basin. It is linked to shallow marginal areas with weak current, where riparian vegetation provides shade. The typical habitat includes submerged roots, fallen leaves, and accumulations of organic debris that serve as shelter and spawning sites. The water is generally warm, soft, and slightly acidic, with low mineral content. In the aquarium, wood, dried leaves, and sturdy plants help recreate this structure. Sudden changes in conductivity, temperature, or pH should be avoided because wild fish may react poorly to rapid fluctuations. Gentle filtration without excessive current better reflects the conditions of the Rio Mamoré.

Precise location and local name

The main geographic reference for Apistogramma erythrura is the Rio Mamoré in Brazil, including its smaller tributaries and slow-flowing side areas. This basin reference is useful in aquaria because it helps distinguish the species from other apistogrammas with similar shapes or color patterns. In the aquarium trade, it is commonly described as the Red-tail Apistogramma, a descriptive trade name rather than a regional vernacular name. The fish offered are wild in origin and therefore represent a population associated with a specific natural basin. A calm aquarium with several separate shelters is recommended to reduce conflict between males and allow females to defend individual territories. Ton.Fish offers this species exclusively in Canada.

Appearance and physical characteristics

The body of Apistogramma erythrura is relatively elongated for a dwarf cichlid, with a proportionate head and well-developed fins in males. Overall coloration changes with mood, sex, and social context, but the red caudal fin is its most distinctive feature. The body may show gray, bluish, or yellowish tones, with darker markings becoming more visible during stress, courtship, or territorial defense. Adult males generally reach about 6 cm, while females remain smaller. The unpaired fins may be longer and more strongly marked in males. A breeding female often becomes more yellow and develops stronger coloration around the spawning area. Because these fish are wild-collected, color intensity may change during acclimation and should not be judged only on arrival.

General diet

Apistogramma erythrura is a small opportunistic predator that searches for invertebrates and tiny organisms among leaves, substrate, and biofilm-covered surfaces. A varied diet supports good condition: brine shrimp, daphnia, cyclops, bloodworms in moderation, and small frozen foods can form the foundation. Quality micro-pellets or granules are usually accepted after acclimation, but wild specimens often respond more quickly to live or frozen foods. It is best to offer small frequent meals, especially at first, rather than one large feeding. Clean, well-rinsed foods help limit pollution in a small aquarium. During breeding, females benefit from protein-rich foods. Dietary variety is especially important for maintaining color and vitality in recently imported wild fish.

Essential data

• River of origin: Rio Mamoré
• Local name used: Red-tail Apistogramma
• Scientific name origin: Apistogramma refers to a distinctive line or marking; erythrura means red-tailed.
• Full name etymology: Apistogramma comes from the Greek apistos, “unreliable,” and gramma, “line” or “mark”; erythrura comes from erythros, “red,” and oura, “tail.”
• Common/vernacular names: Red-tail Apistogramma, Red-tailed Dwarf Cichlid
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: ap-is-toh-GRAM-ma - eh-RITH-roo-ra
• Discovery: Hans Joachim Staeck, 1994
• Maximum adult size: about 6 cm
• Water temperature and pH: 24 to 29 °C; approximately pH 5.0 to 7.0
• Waterway appearance and surrounding vegetation: shaded, slow-flowing areas with roots, fallen leaves, and riparian vegetation
• Typical tankmates: small basin characins, small Corydoras, pencilfish, and other peaceful small midwater fish
• Temperament and behavior: peaceful to moderately territorial; territoriality increases during breeding
• Water depth: shallow areas near banks and submerged cover
• Sexual dimorphism: males are larger and more colorful, with more developed fins; females are smaller and often yellow when breeding
• Bottom structure and flow: soft bottom covered with leaves and debris, with roots; gentle flow

In your aquarium

To succeed with Apistogramma erythrura, provide a mature aquarium, soft warm water, and a layout rich in caves and visual barriers. Fallen leaves, roots, and moderate lighting help reduce stress and encourage natural behavior. Gentle filtration, regular water changes, and a varied diet are essential, especially for wild-collected fish. Since this species is relatively uncommon and offered exclusively by Ton.Fish in Canada, preserving its geographic identity and avoiding mixes with other Apistogramma populations is worthwhile.