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Introduction

The Aulonocara OB, also sold as Blue Sky, is a commercial form associated with the Aulonocara OB group from Lake Malawi. It draws attention with a bright blue base colour covered by irregular markings characteristic of the OB pattern, meaning Orange Blotch. This designation describes a captive-bred selection rather than a distinct scientific species. Its behaviour is generally peaceful for an African cichlid, although males may defend a territory during breeding. With intermediate commercial availability, it is best suited to aquarists able to maintain hard, alkaline and very stable water in a spacious aquarium.

General species description

The Aulonocara OB is a captive form associated with the genus Aulonocara, commonly known as peacock cichlids. The abbreviation OB means Orange Blotch and describes irregular markings that may be orange, brown or dark against a blue base. The name Blue Sky refers to the sky-blue dominant colour seen in many specimens. Because OB forms do not represent one single species, their appearance can vary between breeders. Their popularity comes from the combination of striking colour, relatively moderate temperament and interesting bottom-oriented behaviour. A commercial identification should not be confused with a precise wild locality.

Geographical origin and biotope

The group is associated with Lake Malawi in East Africa, mainly in Malawi, with the lake basin also shared by Tanzania and Mozambique. Wild Aulonocara generally inhabit transition zones between rocky areas and sandy stretches, where they search the sediment for small organisms. The Aulonocara OB sold for aquariums is a selected OB form and therefore does not necessarily correspond to a precise natural population. A layout with fine sand, stable rocks and open shelters suits this type of environment well. Water should remain alkaline, hard and well oxygenated, with efficient filtration and moderate circulation.

Precise location and local name

Blue Sky is a commercial English name used for this bluish presentation of the Aulonocara OB. OB is short for Orange Blotch, a pattern designation widely used in the trade of African cichlids. A single natural locality cannot be assigned to this commercial form in the same way as to a wild geographical population. In aquarium circles, it may be sold as Aulonocara OB, Blue Sky, Orange Blotch Peacock or OB peacock cichlid. These names can cover visually similar but genetically different lines. To maintain a clear strain, keep the original label and avoid crossing it with other Aulonocara.

Appearance and physical characteristics

The body of the Aulonocara OB is relatively deep and laterally compressed, with a terminal mouth and well-developed dorsal and anal fins. Adult males often display metallic blue or sky-blue colouration, enhanced by the irregular markings typical of the OB pattern. The distribution of markings varies considerably; areas may show yellow, orange, brown or black. Females are usually duller, often grey-brown, while juveniles may change colour as they mature. Adult size generally reaches about 12 to 15 cm in aquariums, depending on the line and conditions. Fins may show blue, orange or dark tones.

General diet

Aulonocara are micro-predators that locate prey in the sand using sensory pores on the head. In an aquarium, the Aulonocara OB accepts a varied diet of quality Malawi cichlid pellets, small frozen foods and suitable marine-protein preparations. The base diet should remain moderate in protein and offered in small portions, rather than provided as large occasional meals. Brine shrimp, finely chopped krill or daphnia can supplement the menu without replacing a balanced food. Very fatty foods and overfeeding are best avoided because they contribute to pollution and digestive problems. Several small meals per day are suitable for juveniles and breeding fish.

Essential data

• Origin river name: Lake Malawi; the commercial form is not associated with a river.
• Local name used: OB; Blue Sky.
• Origin of the scientific name: Aulonocara is the genus name used for the peacock cichlids concerned.
• Full-name etymology: Aulonocara comes from the Greek aulos, flute, and kara, head; OB means Orange Blotch.
• Common/vernacular names: Aulonocara OB, Blue Sky, Orange Blotch Peacock, OB peacock cichlid.
• Family: Cichlidae.
• Subfamily: Pseudocrenilabrinae.
• Name pronunciation: aw-lo-no-KAR-uh oh-BEE
• Discovery: the genus Aulonocara was established by Charles Tate Regan in 1922.
• Maximum adult size: approximately 15 cm.
• Water temperature and pH: 24 to 27 °C; pH 7.6 to 8.6.
• Waterbody appearance and surrounding vegetation: lake shores with rocky and sandy areas; aquatic vegetation generally sparse.
• Typical tankmates: Aulonocara baenschi Benga, Copadichromis azureus, Cyrtocara moorii, Labidochromis caeruleus, Synodontis multipunctatus.
• Temperament and behaviour: generally peaceful, but territorial during breeding; searches for food above the sand.
• Water depth: littoral and transition zones; the commercial form has no specific native depth.
• Sexual dimorphism: males are more colourful and often larger; females are plainer, greyish or brownish.
• Bottom structure and flow: fine sand, rocks providing shelter and moderate water movement.

In your aquarium

To keep the Aulonocara OB successfully, provide a spacious aquarium, a sand-and-rock layout, and stable alkaline water. Properly sized filtration, regular water changes and measured feeding are essential. Use several females per male when breeding is desired and monitor crosses with other Aulonocara. Because the OB pattern is variable, each specimen may develop differently with age. Success depends mainly on stable water parameters, sufficient space and tankmates with compatible size and temperament.