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Aulonocara eureka Red is a very popular captive-bred form from the Aulonocara group, valued for its intense red coloration and generally calmer behavior than that of many mbuna. This commercial variety results from aquarium selection and should not be confused with a separate wild species. It suits a Lake Malawi aquarium furnished with rocks, shelters, and well-filtered alkaline water. Its best coloration is usually displayed by mature males, while females remain more subdued. Very common in the trade, this fish still requires careful stocking and compatible tankmates. Good planning is essential for long-term success.

General species description

Aulonocara eureka Red refers to a selectively bred aquarium form of the genus Aulonocara, commonly grouped in the trade with Lake Malawi peacocks. Eureka Red is a variety name rather than a scientific species name. Its appeal comes from the combination of a haplochromine cichlid shape, relatively calm behavior, and red coloration developed through selective breeding. Like other peacocks, it searches the substrate for small prey and edible particles. It remains territorial, especially during spawning, but is usually less quarrelsome than many highly aggressive mbuna. Keeping one male with several females helps distribute courtship pressure. This variety is very common in the aquarium trade, although color intensity and body shape can vary considerably between breeding lines.

Geographic origin and biotope

The geographic reference for Aulonocara eureka Red is Lake Malawi, Malawi, within the East African Rift system. The aquarium variety is produced through selective breeding and does not necessarily represent a specific wild population. The associated peacock biotope includes rocky shorelines, rubble areas, and nearby sandy zones. The water is clear, mineral-rich, and alkaline, with a stable temperature. Rocks provide shelter and visual boundaries, while sandy areas are used for feeding searches. In an aquarium, alkaline pH, strong oxygenation, and effective filtration reproduce these conditions better than a heavily planted layout. Plants are not essential; a few hardy species may be used if they tolerate hard water and cichlid activity.

Precise location and local name

A precise wild locality cannot be reliably assigned to the commercial form Aulonocara eureka Red from the trade name alone. Eureka Red is mainly an international commercial name used by breeders and aquarists. The most common vernacular name is Eureka Red Peacock, also called the red Eureka peacock cichlid. Wild Aulonocara populations in Lake Malawi are normally identified by species and collection locality, a system that does not directly apply to a selectively bred strain. To maintain clear identification, it is best to keep the name Eureka Red and avoid assigning an unsupported wild locality. This caution matters in breeding, since different Aulonocara varieties can readily hybridize in captivity.

Appearance and physical characteristics

Aulonocara eureka Red has a relatively deep, laterally compressed body, a rounded head, large eyes, and well-developed fins. Mature males generally show a base of red, orange, or copper-red, sometimes enhanced by blue reflections on the head and fins. Females are often gray-brown or beige and much less colorful. Exact patterning varies with the strain, age, social position, and water quality. The fins may display contrasting edges and egg spots on the anal fin, particularly in mature males. As in other peacocks, sensory pores on the head help detect movements from small prey in the sand. Aquarium adults usually reach about 12 to 15 cm, with males often becoming the larger sex.

General diet

In nature, Aulonocara eureka Red searches for small invertebrates and other edible particles in the sand. In aquaria, its diet should be varied and based mainly on quality Malawi cichlid pellets, supplemented with small frozen foods such as mysis, brine shrimp, or finely offered krill. Portions should remain moderate to prevent digestive stress and declining water quality. Very fatty foods and regular feeding of mammal meat should be avoided. Plant ingredients are not the core of its diet, but a formula containing some vegetable matter can contribute to a balanced ration. Young fish should be fed more often in small portions, while adults can receive two or three measured meals daily. A sound diet supports the males’ red coloration without attempting to force it through artificial feeding practices.

Essential data

• River of origin: Lake Malawi; no river is associated with this commercial form.
• Local name used: Eureka Red Peacock.
• Origin of the scientific name: Aulonocara is the genus name; Eureka Red is an aquarium variety name.
• Full-name etymology: Aulonocara comes from the Greek aulos, groove or furrow, and kara, head; Eureka Red refers to the Eureka variety and its red coloration.
• Common or vernacular names: Eureka Red Peacock, red Eureka peacock cichlid.
• Family: Cichlidae.
• Subfamily: Pseudocrenilabrinae.
• Name pronunciation: oh-loh-noh-KAR-ah yoo-REE-kah red
• Discovery: Captive-bred commercial form; no zoological description author or year is associated with it.
• Maximum adult size: Approximately 12 to 15 cm.
• Water temperature and pH: 24 to 28 °C; pH 7.6 to 8.6.
• Waterway appearance and surrounding vegetation: Clear lake water, rocky shores, rubble, and sandy areas; aquatic vegetation is generally sparse.
• Typical tankmates: Labidochromis caeruleus Nkhata Bay, Cynotilapia afra Cobue, Copadichromis borleyi Kadango, Synodontis njassae, Sciaenochromis fryeri.
• Temperament and behavior: Relatively peaceful for a Malawi cichlid, territorial around shelters and more active during breeding.
• Water depth: Rocky and sandy littoral zones; exact depth varies among source populations.
• Sexual dimorphism: Males are more colorful, often red and blue; females are duller, usually gray-brown or beige.
• Bottom structure and flow: Sand mixed with rocks and rubble; lake water without a pronounced current.

In your aquarium

Success with Aulonocara eureka Red depends on a spacious aquarium, stable alkaline water, and a rocky layout offering several shelters. Use strong filtration, regular water changes, and tankmates that are not excessively aggressive. A group consisting of one male and several females usually reduces social pressure. Avoid mixing several red or closely related varieties if you want to preserve an identifiable strain, because hybridization is possible. A varied diet offered in small portions completes the care routine. With these precautions, this very common fish can display long-lasting coloration and engaging behavior in a well-structured Lake Malawi aquarium.