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The Astronotus rubrocellatus, also known as the Rio Negro Silver Belly Oscar, is a large South American cichlid associated with the black waters of the Rio Negro in Brazil. Its robust body, massive head and silvery reflections give it the classic appearance of an Oscar, while the reddish belly explains its scientific name. This geographic form remains very rare in the aquarium trade. The specimen offered by Ton.Fish is wild-collected and available exclusively in Canada. It is intended for experienced aquarists able to provide a very large aquarium, powerful filtration and a suitable diet.

General species description

Astronotus rubrocellatus is a large predatory cichlid from the family Cichlidae, known for its intelligence, hardiness and strong interactions with its keeper. Like other Oscars, it may learn to recognize people, rearrange decorations and defend a territory, especially as it reaches adult size. This Rio Negro form is mainly distinguished by its silvery belly reflections and reddish tones. Its care requires substantial space, making a very large aquarium essential, particularly for an adult or pair. Because of its rarity, specimens are sought after by aquarists interested in geographic forms and wild fish. The Ton.Fish offering is exclusive in Canada and consists of a wild-collected fish.

Geographic origin and biotope

This form comes from the Rio Negro in Brazil, a major Amazon tributary characterized by dark, acidic and generally soft water. Its natural habitat includes flooded forest, shaded shorelines and areas where leaf litter releases tannins into the water. Visibility may be limited, while current strength varies among channels, bays and seasonal water levels. In an aquarium, clean, stable and well-oxygenated water is the priority; roots and subdued lighting can help recreate the biotope atmosphere. Extreme acidity should not be maintained without regular testing. Recommended conditions are approximately 25 to 29 °C with a pH of 5.5 to 7.0.

Precise location and local name

The geographic reference associated with Astronotus rubrocellatus is the Rio Negro in Brazil’s Amazon Basin. The English trade name Rio Negro Silver Belly Oscar highlights both its origin and the silvery coloration of its underside. In French, it may be called Rio Negro Silver-bellied Oscar or simply Rio Negro Oscar. Oscar remains the most practical name in the aquarium trade. This geographic population is particularly appealing to aquarists looking for wild fish and forms less common than captive-bred Oscars. It is considered very rare in the specialized market.

Appearance and physical characteristics

The body of Astronotus rubrocellatus is oval, laterally compressed and strongly muscular. Its head is broad, its mouth powerful, and its dorsal and anal fins extend toward the rear, giving the fish an imposing profile. The base coloration is dark to silvery gray, with warmer shades that may appear on the belly and flanks. Markings vary with age, mood, surroundings and water quality. As with other Oscars, coloration often becomes more intense during territorial interactions or spawning. Its most sought-after feature is the silvery belly, accompanied by reddish tones. Under good conditions, adults may reach approximately 35 cm.

General diet

Astronotus rubrocellatus is an omnivore with a strong predatory tendency and accepts a varied aquarium diet. The foundation should be high-quality pellets for large cichlids, supplemented with frozen foods such as shrimp, mussels, worms and suitable whole fish. Insects and other invertebrates can also provide variety. Controlled portions are preferable to overfeeding because Oscars produce considerable waste. Feeder fish, mammal meat and excessively fatty foods should be avoided. A varied diet supports steady growth, good body condition and more stable coloration. Juveniles should receive frequent meals, while adults generally do well with meals spaced farther apart.

Essential data

• Name of original river: Rio Negro
• Local name used: Oscar do Rio Negro; Rio Negro Silver Belly Oscar
• Origin of the scientific name: The genus name Astronotus refers to the star-like appearance associated with the back; the epithet relates to reddish and marked coloration.
• Full-name etymology: Astronotus roughly means starry back; rubro means red and cellatus refers to a spotted or marked coloration.
• Common/vernacular names: Rio Negro Silver Belly Oscar; Rio Negro Silver-bellied Oscar
• Family: Cichlidae
• Subfamily: Astronotinae
• Name pronunciation: as-tro-NO-tus - roo-bro-sel-LA-tus
• Discovery: Römer, 1998
• Maximum adult size: Approximately 35 cm
• Water temperature and pH: 25 to 29 °C; pH 5.5 to 7.0
• Appearance of the watercourse and surrounding vegetation: Tannin-stained blackwater, shaded forest margins, leaf litter and abundant riparian vegetation.
• Typical tankmates: Astronotus ocellatus, Cichla temensis, Geophagus altifrons, Uaru amphiacanthoides
• Temperament and behavior: Intelligent, territorial and generally hardy; may rearrange the décor and become aggressive during spawning.
• Water depth: Variable according to channels, bays and flooded-forest zones.
• Sexual dimorphism: Limited externally; reliable sexing is difficult outside the breeding period.
• Bottom structure and flow: Sandy or muddy substrate with leaves, branches and roots; low to moderate flow depending on the area.

In your aquarium

Success with Astronotus rubrocellatus depends on a very spacious aquarium equipped with oversized filtration and regular water changes. Decorations should be heavy or firmly secured because this cichlid may move objects. Avoid small fish and choose tankmates carefully; a species-only aquarium is often the simplest option. Stable water, tropical temperatures and quality food are essential. Since this is a wild and very rare fish, acclimation should be calm and gradual, with close observation of appetite and behavior.