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The Geophagus dicrozoster is a South American cichlid belonging to the eartheater group. Native to the Orinoco basin, it sifts sand through its mouth to find small prey and edible particles. Its body has a subtle coloration enhanced by bluish reflections and dark markings that become more visible depending on mood and aquarium conditions. This species, uncommon in the trade, is offered as a wild-collected fish and deserves a spacious, well-oxygenated aquarium furnished with a broad area of fine sand.

General species description

Geophagus dicrozoster is a medium-sized eartheater that spends most of its time close to the bottom. Like other members of the genus, it takes sand into its mouth, sorts it through the gill structures, and expels the grains through the opercula. This substrate-sifting behavior is one of its most interesting aquarium traits. The species may be kept in a group when provided with enough space, and a hierarchy becomes more obvious during social interactions or spawning. It prefers stable, clean, well-oxygenated water. Its availability is considered common to uncommon in the aquarium trade, and offered specimens may originate from wild collection.

Geographic origin and biotope

Geophagus dicrozoster comes from the Orinoco basin, mainly in Venezuela, with a range associated with southern tributaries of the system. Its habitat includes tropical waterways with soft bottoms, sometimes stained by organic material from the surrounding forest. The natural environment contains fine sand, fallen leaves, and submerged wood, while vegetation is concentrated along banks and seasonally flooded areas. In an aquarium, it is better to reproduce this open substrate than to heavily plant the bottom, since its digging can uproot plants.

Precise location and local name

The distribution of Geophagus dicrozoster is associated with Orinoco tributaries in Venezuela, particularly in the southern part of the basin. The most commonly used vernacular name in the aquarium hobby is eartheater. Trade names may vary between suppliers, especially for wild fish whose collection locality is not always provided. To preserve the geographic value of the strain, keep any origin information supplied with the specimens.

Appearance and physical characteristics

The body of Geophagus dicrozoster is laterally compressed, with a relatively strong head and a lower mouth adapted for sifting sand. The base coloration ranges from beige to grayish brown, with blue-green reflections on the head and flanks. Dark lateral markings may intensify with stress, dominance, or spawning, while the fins can show reddish or orange tones. Adult size remains moderate for an eartheater, but the fish still needs substantial bottom area. Abrasive substrate may damage its mouth and gill structures.

General diet

In nature, Geophagus dicrozoster searches through the substrate for small crustaceans, larvae, worms, and other organisms, along with plant material and organic debris. In an aquarium, provide a varied diet based on quality sinking pellets, frozen foods, and occasional suitable live foods. Feed small portions so every fish can sift the bottom without creating excessive waste. Very fatty foods or an exclusively meaty diet are unsuitable as a daily foundation; a diverse menu supports steady growth and better coloration.

Essential data

• Original river: Orinoco River and its tributaries
• Local name used: Eartheater
• Origin of the scientific name: Latinized Greek nomenclature
• Etymology of the full name: Geophagus means earth-eater; dicrozoster refers to a divided belt or dark band
• Common/vernacular names: Eartheater
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: gee-oh-fah-gus dye-kroh-zos-ter
• Discovery: Sven O. Kullander, 1986
• Maximum adult size: About 15 cm
• Water temperature and pH: 24 to 30 °C; approximately pH 5.5 to 7.0
• Watercourse appearance and surrounding vegetation: Tropical waterways with sandy bottoms, leaves, submerged wood, and forest vegetation along the banks
• Typical tankmates: Satanoperca daemon, Acarichthys heckelii, Pterophyllum scalare
• Temperament and behavior: Generally peaceful, social, and highly active in the substrate; territoriality increases during spawning
• Water depth: Shallow to medium-depth bottom areas
• Sexual dimorphism: Limited outside spawning; mature males may become larger and more colorful
• Bottom structure and flow: Fine sand, plant debris, and wood; low to moderate current

For greater success

To keep Geophagus dicrozoster successfully, provide a spacious aquarium, effective filtration, and fine, non-abrasive sand. Maintain warm, stable, well-oxygenated water with regular water changes. A group of juveniles allows social relationships to develop more naturally, while hiding places made from roots and stones help reduce tension. Because this is a wild-collected and uncommon species, gradual acclimation and close observation of feeding are especially important. Avoid aggressive tankmates or fish small enough to be swallowed.