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The Yellow Peacock Bass, known scientifically as Cichla kelberi, is a large predatory cichlid native to Brazil. Its golden-yellow coloration, dark ocelli and powerful body make it highly sought after by specialized aquarists. Active, territorial and fast-growing, it requires a very large aquarium, strong filtration and carefully selected tank mates. The specimens offered here are wild-collected, so careful acclimation and a gradual return to feeding are important. It is relatively common through specialized suppliers, but this fish remains best suited to experienced aquarists with the space and equipment needed for a large predator.

General species description

Cichla kelberi belongs to the genus Cichla, a group of large South American predatory cichlids commonly called peacock bass. It has a deep body, a broad mouth and an active open-water hunting style. The species is mainly associated with freshwater environments in the rio Tocantins basin of Brazil. In an aquarium, it quickly becomes dominant and may regard any fish small enough to swallow as prey. It therefore requires a very spacious aquarium, stable water quality and carefully chosen companions. Availability is generally good through specialized suppliers, although wild fish often require more attention during the first stages of acclimation.

Geographic origin and biotope

The natural range of Cichla kelberi is in Brazil, mainly within the Tocantins-Araguaia basin, with a particularly strong association with the rio Tocantins. It uses river sections, side lakes and areas with slow to moderate flow. Water is generally warm, clear to slightly stained and well oxygenated. Shorelines may include beaches, rocks, submerged wood and patches of aquatic or riparian vegetation. An aquarium layout inspired by these habitats should emphasize open swimming space, a few secure shelters and efficient water movement. Heavy decoration should not reduce the area available for swimming.

Precise locality and local name

The most commonly used Brazilian local name is tucunaré-amarelo, literally meaning yellow tucunaré. This name refers to the species’ characteristic golden coloration. Cichla kelberi is associated with the rio Tocantins and parts of the Tocantins-Araguaia basin. In the aquarium trade, the name Yellow Peacock Bass is widely used. Fish sold under this name should be identified carefully because several Cichla species can look similar, and coloration changes with age, mood, habitat and population. Accurate identification is especially useful when selecting compatible fish.

Appearance and physical characteristics

Cichla kelberi has a laterally compressed, powerful body adapted for rapid acceleration. Adult coloration combines golden yellow to olive tones, variable vertical bars and several dark markings, including a conspicuous caudal ocellus. The dorsal fin is long and spiny, while the terminal mouth reflects its predatory lifestyle. Color contrast may intensify during spawning or territorial interactions. Adult size depends on feeding, available space and population, but this is a fish that grows far beyond the dimensions normally suitable for a community aquarium. Its body shape and hunting behavior are best appreciated in a large, uncluttered display.

General diet

In nature, Cichla kelberi is mainly a piscivorous predator, especially effective at hunting small fish and juveniles of other species. Young fish accept small aquatic prey, then gradually shift toward larger food items as they grow. In captivity, provide a varied diet based on healthy feeder fish from a controlled source, pieces of freshwater or marine fish and suitable prepared meaty foods. Meals should remain measured to prevent obesity and excessive waste. Live food collected outdoors should be avoided because of parasite and disease risks. A varied feeding routine is preferable to relying exclusively on one type of prey.

Essential data

• River of origin: Rio Tocantins
• Local name: Tucunaré-amarelo
• Origin of the scientific name: Cichla is the genus name; kelberi is the specific epithet.
• Full-name etymology: Cichla is a genus name of Greek origin used in cichlid taxonomy; kelberi is the specific epithet assigned to the species.
• Common/vernacular names: Yellow Peacock Bass; tucunaré-amarelo
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: sick-lah kel-BEAR-ee
• Discovery: Sven O. Kullander and Efrem J. G. Ferreira, 2006
• Maximum adult size: about 35 cm
• Water temperature and pH: 24 to 30 °C; approximately pH 6.0 to 7.5
• Waterway appearance and surrounding vegetation: warm water, slow to moderately flowing areas, sand, gravel and rock substrates, submerged wood and riparian vegetation
• Typical tank mates: Cichla piquiti; Astronotus ocellatus
• Temperament and behavior: active, territorial and dominant predator; especially dangerous to fish small enough to swallow
• Water depth: shoreline zones and channels of variable depth; exact depth depends on the site and water level
• Sexual dimorphism: difficult to determine in juveniles; adult males may develop a more pronounced nuchal hump, especially during breeding
• Bottom structure and flow: sandy, gravelly or rocky bottoms, often with submerged wood; low to moderate flow depending on the area

For aquarium success

To keep Cichla kelberi successfully, provide a very large aquarium with a secure lid, oversized filtration and highly oxygenated water. Wild-collected specimens should be acclimated gradually and monitored for appetite, parasites and transport-related injuries. Offer quality meaty foods without overfeeding, along with sturdy shelters and a large open swimming area. Compatibility is limited: any small fish may be eaten, and territorial disputes can become severe. Regular maintenance is essential for stable water conditions. Planning the adult size before purchase is one of the most important steps toward responsible long-term care.