Microdontochromis

Genus Overview: Microdontochromis (Small-Toothed Sardines)

The genus Microdontochromis comprises a group of highly specialized, graceful, and peaceful open-water schooling cichlids endemic to Lake Tanganyika. Embedded within the dynamic, pelagic Cyprichromini tribe, these slender, high-speed fish are deeply admired by biotope specialists for their intricate schooling structures, non-aggressive social systems, and delicate metallic colourations.

Micro-Dentition & Open-Water Suction Feeding

The name Microdontochromis is an exact anatomical descriptor derived from the Greek words mikros (small) and odontos (tooth), cleanly identifying their defining taxonomic trademark. Unlike rock-dwelling cichlids that possess broad, heavy jaws lined with large scraping teeth, these open-water specialists carry a highly delicate oral jaw framework lined with rows of thousands of microscopic, uniform outer teeth.

In their natural wild biotope, they are obligate zooplanktonivores. They operate as a powerful pelagic force, tracking massive shifting clouds of microscopic copepods, small aquatic crustaceans, and drifting insect larvae across the intermediate zones where sandy flats flatten out below steep rock reefs.

They have evolved highly protractile, telescope-like jaws. When the shoal moves into a plankton cloud, the fish rapidly pop their mouths forward into a clear, circular suction tube, generating a localized internal vacuum that cleanly snaps up microscopic prey with extreme velocity.

Valid Species Directory

Modern scientific records recognize two valid species within this specialized pelagic lineage:

• Microdontochromis tenuidentatus (Poll, 1951) – The absolute cornerstone type species of the genus, renowned for its ultra-slender horizontal vertical profile and highly active communal schooling structures.
• Microdontochromis rotundiffons (Takahashi, 2005) – The Round-Fronted Sardine Cichlid, distinguished by a slightly more curved, blunt forehead line and subtle variations in vertical fin height.

Females and sub-dominant juveniles carry a highly reflective, flawless silvery-white iridescent base camouflage to mirror sunlit sand ripples and vanish from open-water hunters. Dominant mature males undergo an elegant transformation, developing a soft, shimmering palette of metallic yellow-gold, iridescent teal-blue, and pastel violet flecks framing their high-crested dorsal and deeply fork-shaped tail fin curtains.

Aquarium Husbandry & Harem Dynamics

Adult lengths typically reach a highly manageable 3.5 to 4 inches (9–10 cm). Because they are hyper-active open-water endurance swimmers that must be kept in schools to feel secure, they demand spacious aquariums measuring at least 4 feet in length (55 to 75 gallons minimum). They must always be maintained in groups of 8 to 10 or more individuals to establish a natural social hierarchy.

Replicate their native pelagic biotope by providing massive, completely unobstructed horizontal swimming corridors across the center and upper tiers of the aquarium, backed by an expansive sandy base. Rocks should be kept minimal and confined purely to the background corners.

They are highly advanced **maternal mouthbrooders** that spawn directly over open sand or in mid-water. They are incredibly peaceful, docile, and mild-mannered fish that completely lack territorial malice, acting as magnificent dither tankmates for bottom-dwelling shell-dwellers. They must never be housed alongside rowdy or hyper-dominant rock-dwellers like *Tropheus* or large *Lamprologus*, which will easily bully them. In captivity, they eagerly accept premium commercial flakes, frozen cyclops, daphnia, and baby brine shrimp.