Cyathochromis

Genus Overview: Cyathochromis

The genus Cyathochromis stands out as a highly specialized, evolutionarily distinct branch among the rock-dwelling Mbuna complex of Lake Malawi. It is a monotypic genus containing only a single valid species: Cyathochromis obliquidens. While it shares structural traits with rock-grazing cichlids, this unique fish breaks the mold by avoiding deep rocky reefs entirely to colonize shallow, muddy, and densely weeded habitats.

Spoon-Shaped Teeth & The Botanical Niche

The name Cyathochromis translates from Greek as "cup cichlid," which calls out their highly specialized dentition. Unlike standard Mbuna that possess sharp bicuspid teeth to tear tough algae carpets off solid rock, Cyathochromis obliquidens has evolved flexible, spoon-shaped, or cup-like teeth that curve inwards.

This mouth geometry is engineered exclusively for foraging in thick underwater meadows of Vallisneria (Tape Grass) and Ceratophyllum (Hornwort). The fish swims vertically along a plant leaf, opens its jaws, and glides smoothly up the blade. Its flexible, cup-shaped teeth gently comb and scrape loose epiphytic algae and microscopic organisms right off the delicate leaves without puncturing or severing the living plant tissue.

Species & Colour Profile

There is only one recognized species within this lineage:

• Cyathochromis obliquidens Trewavas, 1935

Females and juveniles display a cryptic olive-tan camouflage marked by two distinct horizontal bars and subtle vertical bands to blend in with dense aquatic vegetation. Dominant males develop a gorgeous pale yellow-green to soft powder-blue body colouration, highlighted by vibrant orange-red splashes across the pelvic, anal, and caudal fins.

Aquarium Husbandry

Adults typically reach a maximum length of roughly 5 to 6 inches (13–15 cm), making them suitable for 55-gallon or larger aquariums. Because of their natural habitat, they are one of the very few Mbuna species that highly appreciate a planted aquarium. Providing dense groupings of hardy, fast-growing plants like large Vallisneria allows them to display their natural foraging behaviours.

They are a remarkably peaceful genus compared to most other rock-dwelling cichlids. To prevent severe digestive blocks like "Malawi Bloat," they must be fed a strictly herbivorous diet high in spirulina flakes, premium veggie pellets, and vegetable matter.