Geophagus pellegrini

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Introduction

Geophagus pellegrini, also known as the Yellow Hump Eartheater, is a South American cichlid recognized for its yellowish nuchal hump and characteristic substrate-sifting behavior. Native to Colombia, it inhabits waterways of the Rio Choco region, where it searches through sand and sediment for small food organisms. This relatively uncommon aquarium species is offered here as a wild-collected fish and as an obvious Ton.Fish exclusive in Canada. Successful care requires a spacious aquarium, a fine substrate, warm water and excellent water quality.

General species description

Geophagus pellegrini is a medium-sized eartheater adapted to life close to the bottom. It uses its protrusible mouth to draw in sand, sift it and extract edible particles before expelling the grains through the gill openings. It is generally peaceful, although it becomes more territorial during breeding. Keeping juveniles in a group allows pairs to form naturally, but adults must have enough space. In aquariums, this species benefits from an open layout and efficient filtration because its constant digging keeps fine particles suspended. Its commercial availability is moderate: it is uncommon, but not limited exclusively to specialists. Since these are wild specimens, careful acclimation and quarantine are recommended.

Geographical origin and biotope

Geophagus pellegrini comes from Colombia, in the Rio Choco region, a humid area along the Colombian Pacific slope. Its natural habitat consists of tropical rivers and tributaries where the water is warm, well oxygenated and generally flowing. The bottom is made of sand, fine gravel and plant debris, with quieter areas where the fish can forage. Banks are often bordered by dense vegetation that provides shade and adds leaves and organic matter to the watercourse. To recreate this habitat, use soft to moderately mineralized water, moderate flow, roots and a broad area of fine sand. A temperature of 25 to 29 °C and slightly acidic to neutral pH suit its aquarium care.

Precise location and local name

The species is associated with the Rio Choco in Colombia, within the river system of the Chocó region. Collection and trade information may use a broad regional designation rather than a highly precise collecting site. In its native range, freshwater cichlids are commonly called vieja or mojarra, depending on the region and local usage. The English name Yellow Hump Eartheater refers directly to the yellow coloration on the upper part of the head and to the digging behavior typical of eartheaters. In the aquarium trade, the scientific name remains the safest way to identify the fish, especially when dealing with wild fish from different regional collections.

Appearance and physical characteristics

Geophagus pellegrini has an oval, laterally compressed body, a relatively large head and a forward-facing mouth. Its most distinctive feature is the yellowish nuchal hump, which is especially visible in mature fish in good condition. Overall coloration ranges from beige to olive brown, with metallic reflections and darker markings along the flanks. The fins may show yellow, orange or reddish tones, particularly in dominant males. As in many eartheaters, thick lips and a protrusible mouth help it sift sand. Adult males are often larger, with more elongated fins and a stronger profile. A suitable diet, clean water and moderate lighting help display its natural coloration.

General diet

In nature, Geophagus pellegrini feeds mainly on small invertebrates, larvae, microscopic crustaceans, organic matter and plant particles recovered from the substrate. Offer a varied diet in small portions several times a day. Quality sinking pellets, frozen foods such as brine shrimp and bloodworms, and preparations containing plant ingredients are suitable. Food should be small enough to swallow easily. Sifting sand is an important feeding behavior, but it does not replace regular meals. Avoid overly fatty foods and excessive feeding, which can quickly reduce water quality. A varied diet supports growth, body condition and development of the nuchal hump.

Essential data

• Native river: Rio Choco
• Local name: Vieja; mojarra
• Origin of the scientific name: Geophagus is a genus of eartheating cichlids; pellegrini honors Jacques Pellegrin.
• Etymology of the full name: Geophagus means earth-eater; pellegrini is the Latin genitive form of Pellegrin.
• Common and vernacular names: Yellow Hump Eartheater; yellow-hump eartheater; vieja; mojarra
• Family: Cichlidae
• Subfamily: Geophaginae
• Name pronunciation: gee-oh-FAH-gus - pel-leh-GREE-nee
• Discovery: Charles Tate Regan, 1912
• Maximum adult size: About 15 cm
• Water temperature and pH: 25 to 29 °C; pH 6.0 to 7.2
• Watercourse appearance and surrounding vegetation: Warm, oxygenated tropical waterways with sand, plant debris, roots and dense bank vegetation.
• Typical tankmates: Andinoacara biseriatus, Geophagus steindachneri, Hyphessobrycon columbianus
• Temperament and behavior: Peaceful to moderately territorial; actively sifts sand and defends an area during breeding.
• Water depth: Shallow to medium-depth areas of rivers and tributaries.
• Sexual dimorphism: Males are often larger and more colorful, with more developed fins and a more pronounced nuchal hump.
• Bottom structure and flow: Fine sand, gravel and leaves; moderate to strong flow with quieter refuges.

In your aquarium

For successful care of Geophagus pellegrini, provide a spacious aquarium with a broad area of fine sand, oversized filtration and strong oxygenation. Keep the water warm, stable and low in nitrogenous waste. Roots, smooth stones and open areas encourage natural behavior, while plants should be firmly anchored. Avoid aggressive or very small tankmates. Because these fish are wild collected, acclimation, quarantine and gradual feeding are especially important. This is a Ton.Fish exclusive in Canada and an uncommon species in the aquarium trade.