Blue Dolphin Moorii OB Care Guide - Aquarium Setup, Diet & Breeding

Blue Dolphin Moorii OB are distinctive Lake Malawi cichlids with the rounded forehead, elongated body and soft blue colouring associated with the Blue Dolphin Moorii. Their OB pattern adds irregular orange, peach or rust-coloured blotches across the body and fins, making each fish individually patterned. The intensity and balance of blue and orange can vary considerably between specimens.

As they mature, males usually develop a prominent nuchal hump and a fuller, more imposing profile. Despite their size, they are generally less combative than many strongly territorial Malawi Mbuna, although mature males can become assertive around spawning areas and rivals.

In the wild, Cyrtocara moorii lives around sandy areas and gently sloping habitats in Lake Malawi. It is known for following larger substrate-disturbing fish and picking through the material they displace, searching for small invertebrates and other edible items.

The Blue Dolphin Moorii OB is an ornamental colour variety, so its appearance does not represent a naturally occurring wild population. Its unusual orange-and-blue pattern, peaceful disposition by Malawi cichlid standards and large size make it a notable choice for a spacious African lake community.

Blue Dolphin Moorii OB is a selectively bred aquarium form associated with Cyrtocara moorii, a cichlid native to Lake Malawi in East Africa. The orange-blotched, or OB, pattern is a cultivated colour morph rather than a standard wild colour form of the species.

A single adult or a small group requires at least 300 litres, with a larger aquarium of 400 litres or more preferable for a mixed community. Aim for a tank at least 150 cm long when keeping several adults, as floor space is more important than height. Use fine sand or another smooth substrate, with rockwork arranged into caves and visual barriers while leaving broad open areas for swimming and foraging. Strong biological filtration, good oxygenation and stable, alkaline water are essential.

Males can reach about 20 cm (8 in) in aquarium conditions, while females are usually smaller at around 15–17 cm (6–6.7 in). Exceptional males may approach 25 cm (10 in) in very large, well-maintained aquariums.

Blue Dolphin Moorii OB are omnivorous opportunistic feeders. Offer a varied diet based on high-quality cichlid pellets or granules, supplemented with spirulina-based foods, flakes and occasional frozen or live foods such as brine shrimp, mysis and finely chopped aquatic invertebrates. Feed modest portions once or twice daily. Avoid relying on fatty mammal or bird-based foods, which are unsuitable for Malawi cichlids.

Suitable companions include other relatively peaceful Lake Malawi Haps and peacocks of comparable size, such as Copadichromis, Placidochromis and Aulonocara species, provided the aquarium is large enough and the fish have compatible temperaments. Avoid very aggressive Mbuna, highly territorial Malawi cichlids and fish small enough to be swallowed. Mixing different colour forms or closely related Cyrtocara can also create identification and hybridisation concerns, particularly if breeding is intended.

Blue Dolphin Moorii OB are maternal mouthbrooders. Provide a group with one male and several females, then offer open sand or a flat rock as a spawning site. After courtship and egg laying, the female picks up the eggs and carries them in her mouth for around three weeks. She releases free-swimming fry that can be raised on newly hatched brine shrimp and finely powdered fry food. The female should be left undisturbed while holding, as stress can cause her to swallow or abandon the brood.

Males are generally larger and more robust, with a deeper blue colour, longer finnage and a more pronounced forehead or nuchal hump as they mature. Females remain smaller and are often less intensely coloured, although individual pattern and colour can make sexing young fish difficult.