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Biotodoma wavrini is a South American cichlid belonging to the eartheater group, valued for its elegant shape and substrate-sifting behavior. This relatively uncommon aquarium fish comes from the Orinoco basin, particularly the Rio Ventuari, where it searches fine substrates for food. Successful care requires soft, acidic to slightly neutral water, efficient filtration, and a layout with calm areas. Peaceful outside breeding periods, Biotodoma wavrini is best suited to a carefully planned regional aquarium with calm tank mates of similar size. Wild-collected specimens require thoughtful acclimation and attentive feeding.

General species description

Biotodoma wavrini is a benthic cichlid in the genus Biotodoma, associated with South American eartheaters. It is recognized by its habit of filtering substrate through the mouth while searching for small organisms and edible particles. It is generally peaceful, although it may defend a territory or spawning site. Its behavior is especially interesting when young fish are kept in a group before pairs form. In an aquarium, it needs substantial bottom area, fine, non-abrasive sand, and stable water conditions. With a rarity level of 2 out of 3, meaning fairly uncommon, it is best suited to aquarists able to recreate a South American stream environment with care.

Geographical origin and biotope

The species is associated with the upper Orinoco basin, in the region of the Rio Ventuari in Venezuela. This area includes tropical waterways with soft water and generally low mineral content. The fish occurs in calm or moderately flowing areas near banks, sandy patches, and areas containing plant debris. Aquarium water should be soft and well oxygenated, with a temperature of 24 to 29 °C and an acidic to neutral pH. Gentle but continuous filtration and regular water changes are preferable to strong, uniform current throughout the aquarium.

Precise location and local name

The geographical reference most directly associated with Biotodoma wavrini is the Rio Ventuari, an important tributary of the upper Orinoco basin in Venezuela. In the English-speaking aquarium trade, the name Wavrini eartheater is used. French aquarists may encounter translations such as Wavrini eartheater or Wavrini eartheater cichlid. This species can be confused with other members of the genus Biotodoma, especially Biotodoma wavrini cupido, making correct identification and collection locality important. Wild fish should be acclimated gradually and offered easily accepted foods after arrival.

Appearance and physical characteristics

Biotodoma wavrini has a fairly deep, laterally compressed body, a rounded head, and a mouth adapted for taking food from the bottom. Its base coloration is usually silvery to grayish brown, often showing blue or green reflections depending on mood and lighting. A dark mark on the flank helps with identification, while the fins may show reddish, orange, or bluish tones. The dorsal and anal fins become elongated, particularly in adult males. Its build is slimmer and less massive than that of many larger geophagus-type cichlids, with a maximum size of approximately 12 cm.

General diet

In nature, Biotodoma wavrini sifts sand and sediment while taking in small prey, organic debris, and plant material. The aquarium diet should therefore be varied and delivered so that it reaches the bottom. Quality sinking pellets, frozen foods such as brine shrimp and mosquito larvae, and small portions of live food are suitable. Several small meals are preferable to one large feeding. Fine sand allows the fish to display its natural behavior without damaging its lips or gill areas. A varied diet supports coloration, growth, and overall condition, especially in wild-collected specimens.

Essential data

• Name of native river: Rio Ventuari
• Local name used: Wavrini eartheater
• Origin of the scientific name: Biotodoma is the genus name; wavrini is the specific epithet.
• Full-name etymology: Biotodoma refers to the morphology of the genus; wavrini honors Robert de Wavrin.
• Common/vernacular names: Wavrini eartheater.
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: bye-oh-toh-DOH-mah - vah-VREE-nee
• Discovery: Jacques Pellegrin, 1932
• Maximum adult size: Approximately 12 cm
• Water temperature and pH: 24 to 29 °C; approximately pH 5.5 to 7.2
• Appearance of the watercourse and surrounding vegetation: Soft tropical water, wooded banks, leaf litter, and sandy areas.
• Typical tank mates: Biotodoma cupido, peaceful small characins, suitable-sized Corydoras, and peaceful small loricariids.
• Temperament and behavior: Peaceful to moderately territorial; actively sifts the substrate and defends a territory while breeding.
• Water depth: Shallow to moderately deep areas near banks and sandbars.
• Sexual dimorphism: Males are often larger, with more extended dorsal and anal fins; sexing can be difficult outside breeding.
• Bottom structure and flow: Fine sand, plant debris, and low to moderate current.
• Wild-collected species: Yes, this profile concerns a wild-collected species.
• Rarity: Level 2 out of 3, fairly uncommon in the aquarium trade.

For greater success

Success with Biotodoma wavrini depends on a spacious aquarium with open bottom area, fine sand, and consistently clean soft water. Because this is a wild-collected species, acclimation, quarantine, and dietary variety are especially important. Avoid aggressive tank mates and sharp decorations. Moderate lighting, roots, a few robust plants, and regular water changes will help reduce stress. By respecting these requirements and observing its natural sifting behavior, the aquarist can maintain an unusual, peaceful, and fascinating cichlid. Careful sourcing also helps support responsible aquarium keeping and better long-term conservation practices.