Zebra Mbuna

The body is elongated with a slightly convex head; the dorsal and anal fins taper toward the tips. Coloration varies widely: specimens come in blue, orange, black-and-white, and blue-black. This colour diversity reflects both natural variation and selective breeding. To the casual aquarist, it can be difficult to identify this species visually. Buy only from reputable breeders or well-known dealers to avoid mistakes. Many cichlids from Lakes Malawi and Tanganyika look very similar, and one species is often sold as another. Males are larger and more intensely coloured than females. The anal fin bears a pattern of coloured spots. Males also develop a distinctive frontal hump that becomes more pronounced with age.

Wild zebra mbuna are found nowhere but Lake Malawi in Africa. They inhabit rocky shores, reefs and islands at various depths. They belong to the Mbuna group, a name derived from the local language meaning "rock dwellers".

This fish shows extreme aggression and incompatibility toward other species. Males are especially combative with each other. A small group of one male and 2–3 females can be kept, but only in a tank of at least 200 litres with ample hiding places. Without sufficient space, the females will be relentlessly attacked. If you plan to keep several cichlids, allow a minimum of 200 litres per male.

Lake Malawi cichlids require similar water conditions. The paramount requirement is high water quality and purity. The water should be slightly alkaline with medium to high hardness. For detailed information on water composition and how to adjust its parameters, see the section on water chemistry. A 10–15% water change weekly is recommended; if filtration is weak, increase this to 25%. Vacuum the substrate at least once a week. Zebra mbuna are extremely sensitive to pollution. An efficient filtration system is central to maintaining biological balance. Choose the most powerful filter your budget allows. Other essential equipment includes a heater, an air pump and a light. Tank decor should mimic the natural habitat. Live plants are usually absent; use only a few plastic ornaments if any. Most of the space should be taken up by rocky outcrops and stones with many crevices and caves. Use coarse sand as substrate.

Most commercial dry foods suit these fish. However, the diet should be primarily plant-based: flakes enriched with algae (often spirulina) or dried nori seaweed, which is sold in supermarkets for sushi rolls. Periodically supplement with protein-rich foods such as bloodworm and brine shrimp. Avoid excessive protein, as it can cause obesity and digestive problems.

In a harem group, fry are not long in coming. During spawning, the male's colours become even more vivid to attract the female. He selects a suitable spot on the sandy bottom, usually clear of obstacles, and digs several pits that serve as spawning sites. The female lays eggs in these depressions one batch at a time, immediately taking them into her mouth. She repeats this in several pits until her mouth is full of eggs. Fertilization happens in an unusual way: the male's anal fin pattern mimics eggs, and the female, mistaking them for another batch, tries to take them into her mouth. At that moment the male releases sperm, and fertilization occurs. The female carries the brood for 3–4 weeks before releasing the fry to swim freely. During this entire period she cannot eat, so if she was underfed before spawning, the brood may be at risk of being consumed. This reproductive strategy is typical of most Lake Malawi cichlids and ensures high fry survival in a competitive environment.

With proper care and a balanced diet, health problems are rare. Poor water quality and unbalanced feeding are the main causes of disease. If several males are kept together—which is not recommended—physical injuries are common and can lead to secondary fungal and bacterial infections.

When selecting fish, consult experienced breeders or specialist shops: because of the high species diversity and similarity among Lake Malawi cichlids, there is a risk of buying the wrong species. A healthy fish is active and displays bright, saturated colours typical of its morph. Avoid specimens showing signs of emaciation, fin damage, spots or cloudiness on the body, or fish that look sluggish or hide in a corner during feeding.