Haplochromis nyererei

Adults usually reach 7–8 cm. Males are larger and more colourful than females: they have a bright orange back, a deep blue belly, and yellow vertical stripes along the body. Females are grey, with red or blue pigmentation only on their fins and tail. At least 11 different colour variations exist, each with slightly different markings. The island where a variation was found is often included in its name.

This species naturally inhabits Lake Victoria, Africa's largest lake, which borders Tanzania, Uganda, and partly Kenya. The fish is found mainly in the southern part of the lake, among numerous islands. The landscape features rocky outcrops along an irregular shoreline riddled with crevices and caves; aquatic plants are rare in these areas.

Males are aggressive toward each other, and in confined space their fights can be fatal. Keep a group of one male and several females in one tank. Toward other species, this fish shows relatively neutral behaviour. It is compatible with other Lake Victoria fish and with Mbuna cichlids.

A group of 3–4 fish needs a tank of at least 250 litres. Use a gravel and sand substrate with large stones and rock fragments to create crevices and caves. The long-term health of Haplochromis nyererei depends on stable water conditions within the acceptable ranges of temperature and water chemistry. Beyond installing the necessary equipment, this requires regular maintenance: a weekly water change, timely removal of organic waste, and constant monitoring of nitrogen compounds in the water.

This species is omnivorous and readily eats most standard aquarium foods. Daily meals can consist of dry flakes or pellets, supplemented with live or frozen daphnia, brine shrimp, and bloodworms.

Breeding is straightforward. The fish use a strategy typical of many African cichlids, especially Lake Malawi dwellers. The female lays dozens of eggs, which she immediately takes into her mouth after fertilization. The eggs incubate in her mouth for about 3 weeks. The fry stay under her protection for some time until they are large enough.

Poor keeping conditions are usually the main cause of disease. When water parameters fall outside acceptable ranges, the fish's immunity is weakened, making it vulnerable to infections always present in the environment. At the first sign of illness, check the water parameters immediately and ensure nitrogen cycle products are not at dangerous levels. Restoring optimal conditions often brings recovery on its own. In some cases, medication may be needed.

Choose active fish with clean fins and no visible skin damage. Avoid specimens showing signs of emaciation, a sunken belly, or unusual behaviour such as lethargy or staying at the surface. Given strong intraspecific aggression, buy a group with more females than males, as males can show strong territoriality even in the shop.