Dubois's Tropheus Care Guide - Aquarium Setup, Diet & Breeding

Dubois's Tropheus is a distinctive Lake Tanganyika cichlid whose appearance changes dramatically with age. Juveniles are dark, almost black fish covered with numerous pale blue-white spots, giving them a starry appearance. As they mature, the spots largely disappear and a broad pale band develops around the body, contrasting with the dark head and rear portions.

This species has the deep-bodied, robust shape typical of Tropheus and uses its small, specialised mouth to rasp growth from rocks. It is an active, alert fish that spends much of its time moving over hard surfaces and investigating its surroundings.

In nature, Dubois's Tropheus lives among the boulder fields and rocky shorelines of Lake Tanganyika. These habitats are rich in algae and other tiny organisms, and the fish commonly feeds in the shallow surge zone where rocks provide both grazing surfaces and shelter.

Like other Tropheus, it is strongly social but can be intense and territorial, especially around feeding areas and breeding sites. Its striking juvenile and adult colour forms, combined with its lively group behaviour, make it one of the most recognisable cichlids from Lake Tanganyika.

Dubois's Tropheus is endemic to Lake Tanganyika in East Africa. It occurs around rocky coastal habitats, particularly in the northern part of the lake, where it grazes algae and microorganisms from hard surfaces.

A group should be housed in an aquarium of at least 300 litres, with a footprint of roughly 120 × 45 cm; a larger tank is preferable for a mature colony or when keeping tankmates. Use a hard, alkaline-water-compatible setup with plenty of stacked limestone or other smooth rockwork, creating caves, visual barriers and multiple territories while leaving open swimming space. A fine sand substrate is ideal, and strong biological filtration with good oxygenation and modest water movement helps reproduce the clean, wave-swept conditions of its natural habitat.

Up to 15 cm (6 in) in adult length; males are often slightly larger and more heavily built than females.

Dubois's Tropheus is a specialised herbivore that grazes aufwuchs, algae and the small organisms living within it. Offer frequent portions of a high-quality spirulina- or vegetable-based flake and pellet food, supplemented with blanched leafy greens such as spinach or romaine lettuce. Avoid rich, fatty or meat-heavy foods, as an unsuitable diet can contribute to the serious digestive disorder commonly called Malawi bloat in herbivorous African cichlids.

Suitable tankmates include robust Lake Tanganyika species that tolerate alkaline water, such as certain Julidochromis, Synodontis petricola and compatible Tanganyikan goby cichlids, provided the aquarium is spacious and carefully arranged. Avoid peaceful, slow-moving community fish, fin-nippers and species requiring soft or acidic water. Other Tropheus species and similarly shaped algae-grazing cichlids can provoke severe territorial conflict, and mixing different Tropheus types may also result in unwanted hybrids.

Dubois's Tropheus are maternal mouthbrooders that breed readily in a mature colony when well conditioned on a varied, vegetable-based diet. The male courts a receptive female over a chosen area, and she picks up the fertilised eggs in her mouth. She usually carries the brood for around three to four weeks, during which time she may eat very little. Fry can be released among rocks and raised on finely crushed spirulina-based foods and small vegetable-rich foods.

Dubois's Tropheus shows little reliable external sexual dimorphism. Mature males may be somewhat larger, deeper-bodied and more assertive, while females are often slightly smaller, but sex is difficult to determine confidently from appearance alone.