Aulonocara OB

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Overview

Aulonocara OB, also sold as Five Colors, is an ornamental form from the Aulonocara group, recognized by its irregular OB (Orange Blotch) pattern. Orange, red, blue and sometimes yellow markings stand out against a blue or bluish background, explaining its trade name. Very common in the aquarium trade, this fish is valued for its striking coloration and generally calmer behavior than many mbuna cichlids. Like other Lake Malawi cichlids, however, it requires alkaline water, strong filtration and a carefully arranged aquarium with suitable companions.

General description

Aulonocara OB belongs to the peacock cichlid group, in the genus Aulonocara, associated with Lake Malawi. OB describes a color pattern rather than a distinct scientific species. This form is mainly selected in captivity for its combination of irregular orange markings and blue coloration. It is usually less aggressive than many mbuna, although males may defend a small spawning area. A spacious aquarium, excellent water quality and tankmates with a similar temperament are important for long-term success.

Geographic origin and biotope

Aulonocara are associated with Lake Malawi, shared by Malawi, Tanzania and Mozambique. Aulonocara OB, however, is a commercial OB form and does not represent a wild population from one specific site. Related Aulonocara commonly use sandy areas near rocks, where they search the substrate for small organisms. In the aquarium, fine sand, stable rock piles and open swimming areas provide a suitable interpretation of this habitat.

Precise locality and local name

The trade name Aulonocara OB does not refer to a precise geographic locality. “OB” means Orange Blotch, describing the orange blotches, while Five Colors is a commercial name referring to its varied coloration. Traditional local names associated with a wild population do not apply to this captive-bred variety. It is best described as a commercial Aulonocara OB rather than as a species or a geographically defined wild form.

Appearance and physical characteristics

The body is relatively deep and laterally compressed, with well-developed fins. Adult males usually show the strongest colors: a blue base, contrasting fins and irregular orange blotches across the body and fins. Females are often duller, gray-brown or silvery, with a less distinct pattern. The protrusible mouth and sensory pores on the head are typical Aulonocara features and help the fish detect prey hidden beneath the sand.

General diet

Aulonocara OB readily accepts a varied diet of quality Malawi cichlid pellets, small frozen foods and formulas containing moderate marine or plant ingredients. Meals should be small and regular to reduce waste. A fiber-rich diet suited to non-mbuna cichlids is preferable to very fatty foods. Mosquito larvae and other live foods may be offered occasionally, but overfeeding and predator-oriented foods should be avoided.

Essential data

• River of origin: Lake Malawi; no specific river is associated with this commercial variety
• Local name used: Aulonocara OB; Five Colors
• Origin of the scientific name: Aulonocara is the genus name used for Malawi peacock cichlids
• Etymology of the full name: Aulonocara identifies the genus; OB means Orange Blotch; Five Colors is a trade name
• Common/vernacular names: Aulonocara OB; Five Colors; Orange Blotch Peacock
• Family: Cichlidae
• Subfamily: Pseudocrenilabrinae
• Name pronunciation: aw-lo-no-ka-ra oh-bee
• Discovery: commercial varieties produced through aquarium selection
• Maximum adult size: about 15 cm
• Water temperature and pH: 24 to 28 °C; pH 7.8 to 8.6
• Stream appearance and surrounding vegetation: clear lake water, rocky shores and sandy areas; generally sparse aquatic vegetation
• Typical tankmates: compatible Aulonocara, peaceful Malawi cichlids of similar size and non-territorial species requiring the same parameters
• Temperament and behavior: generally peaceful, but territorial while spawning; keeping one male with several females is recommended
• Water depth: littoral areas and rocky or sandy slopes
• Sexual dimorphism: males are more colorful; females are duller and often smaller
• Bottom structure and flow: fine sand, rocks forming shelters and moderate to strong water circulation

In your aquarium

Keeping Aulonocara OB successfully requires a spacious aquarium with fine sand, rocky shelters and stable, alkaline, well-oxygenated water. Oversized filtration, regular water changes and controlled feeding help preserve its colors. Avoid highly aggressive tankmates and mixtures of closely related forms that could encourage hybridization. Keeping several females with one male also helps distribute territorial pressure and supports more balanced behavior in the aquarium.