Lake Malawi mbuna

Lake Malawi's rocky shoreline is divided into two cichlid worlds, and the mbuna own the rocks. They are the lake's grazers: built to scrape aufwuchs — the dense film of algae and the tiny invertebrates living in it — from stone, with jaws and teeth shaped for the job and a temperament to match. Each fish holds a patch of reef and drives off rivals and neighbours alike, which is why a tankful of mbuna is the most colour-saturated, most kinetic display in the hobby, and also the most demanding to balance.

Nearly all are maternal mouthbrooders: the female takes the fertilised eggs into her mouth and carries the developing fry for around three weeks without feeding, releasing them fully formed. Combined with the rock-bound territoriality, this makes mbuna both easy to spawn and prone to aggression, so they are kept differently from most aquarium fish — crowded deliberately, over plenty of rockwork, so no single fish can monopolise the tank. They need the lake's water: hard and strongly alkaline, around pH 7.8–8.6, in the mid-20s °C.

The mbuna are a textbook case of a species flock — hundreds of forms radiating around the same rocky habitat — so they read best against Lake Malawi itself. Each genus and species below links to its profile, distribution and water tolerances.