Cichlid Atlas — the world's cichlid waters, in depth

Taxonomy & naming

Mchenga cyclicos was described in 1993 by Jay Stauffer, Thomas LoVullo and Kenneth McKaye, in a Copeia paper introducing three new sand-dwelling cichlids from Lake Malawi alongside a reassessment of the sprawling genus Copadichromis. They originally placed the fish as Copadichromis cyclicos, with a holotype — an adult male of 115.6 mm standard length — collected at Kanchedza Island off the Nankumba Peninsula.

Thirteen years later, Stauffer and Ad Konings revised Copadichromis again and split off a new genus, Mchenga, designating C. cyclicos as its type species. The genus now holds six valid species; M. cyclicos sits alongside its close relatives M. conophoros and M. thinos, the other two fish from the 1993 paper. The catalog authorities (Eschmeyer's Catalog of Fishes, FishBase) and the IUCN all carry the current combination, listing Copadichromis cyclicos as a synonym, so a reader who finds the old name on an older aquarium label or museum tag is looking at the same fish.

The genus name is the most charming detail in the nomenclature: mchenga is the Chichewa word for sand, chosen by Stauffer and Konings to flag the sandy bowers these fish construct. The species epithet cyclicos points to the rounded, cyclical form of that bower.

Appearance

This is a modestly sized cichlid. The original description records a maximum of about 12 cm standard length — roughly 4.8 in (12 cm) — with the type series running from juveniles near 6.7 cm up to that largest male; the everyday adult is a 4-to-5-inch fish. The body is the unremarkable, fusiform shape of an open-water plankton-picker rather than the deep, slab-sided profile of a rock-grazer.

Meristics from the description are the surest way to separate it from its many look-alikes: 16-17 dorsal spines and 10-12 soft rays, 8-9 anal soft rays, around 33-34 lateral-line scales, and 10-12 gill rakers on the outer ceratobranchial — a count that matters because gill-raker number tracks how finely a fish strains plankton. Diagnostically, females and non-breeding males lack the yellow egg-spot ocelli on the anal fin that adorn many haplochromine males. A breeding male turns on black markings in the caudal fin, and his outer jaw teeth are small and bicuspid. As with most utaka, dominant breeding males are the showy ones; females and subordinate males stay a cryptic, countershaded silver that makes a shoal hard to tell apart at a glance — part of why these fish are notoriously confusing in the field.

Range & habitat

Mchenga cyclicos is a Lake Malawi endemic, and a narrowly distributed one. Every confirmed record comes from the Nankumba Peninsula in the southern arm of the lake, near the type locality at Kanchedza Island and nearby Msuli Point. The IUCN assessment puts its estimated extent of occurrence at just 240 km² and area of occupancy at 44 km² and treats it as known from a single location, while flagging that it may well prove more widespread once the lake's poorly surveyed sandy zones are looked at properly.

The habitat is the open sand-and-water world that defines the utaka guild rather than the rocky reefs most aquarists picture when they think "Malawi cichlid." FishBase records it from shallow water, roughly 2-3 m, and breeding bowers are built over sand at depths of about 3-7 m — so this is a shallow, near-shore, sand-floored fish, not a deep-water one. Lake Malawi's surface water is warm (mid-20s °C), hard and alkaline, with a stable pH around 7.7-8.6 and high clarity over open sand, the chemistry every captive of this guild expects.

Ecology & diet

M. cyclicos is a zooplanktivore. It forages up in the water column, picking copepods and other small crustaceans and their larvae out of the open water — the feeding mode that earns the whole utaka assemblage its name and its commercial value. FishBase places it at a trophic level of about 3.4, consistent with a secondary consumer that lives on animal plankton rather than algae or detritus.

Ecologically, the utaka occupy a productive but crowded niche. Lake Malawi's offshore and sandy-shore waters support large, shifting clouds of these silvery planktivores, and they in turn are a staple prey for larger predatory cichlids and a cornerstone of the lake's artisanal fishery. The fine gill rakers and small bicuspid teeth of M. cyclicos are the working hardware of that lifestyle: equipment for straining and handling small, soft, mobile prey rather than scraping or crushing. Where rock-dwelling mbuna are trophic specialists carving up the algae film, the sand-dwelling utaka are the lake's mid-water plankton harvesters.

Behavior & breeding

Like every endemic Malawi cichlid, M. cyclicos is a maternal mouthbrooder: the female collects the eggs and incubates the developing young in her buccal cavity, with no paternal care. What sets the sand-dwellers apart is how the eggs get fertilized. Males are bower-builders. Each breeding male leaves the feeding shoals, claims a patch of sand, and constructs a cone-shaped bower — a "castle" in the terminology researchers use to separate raised mounds from the pits dug by other genera. The bowers are clustered into breeding arenas, classic leks where dozens of males display side by side.

These structures are not incidental. Across Lake Malawi's bower-builders, bower shape and size are species-specific enough that taxonomists use them as field characters, and they function as honest signals of male quality. Field experiments on lekking Malawi sand-dwellers — work from the same research group that described this fish — showed that females discriminate among males by bower size, choosing larger, well-built bowers; artificially altering bower height shifted female preference. So a male M. cyclicos that has built and defended a tidy cone is advertising stamina and fitness, and a visiting female is reading that advertisement. The IUCN assessment notes spawning runs year-round with two peaks, roughly January-March and August-September. The flip side of all this construction is intense male-male competition: arena males spend weeks building, repairing and defending against neighbors that would happily steal their sand.

In the aquarium

Be honest with yourself before chasing this one: M. cyclicos is essentially never in the ornamental trade. The IUCN explicitly notes it is not targeted by the aquarium fishery — it reaches hobbyists, if at all, as a rare specialist import, and most "utaka" sold under Copadichromis or Mchenga labels are commoner relatives. There is little first-hand keeping literature specific to this species, so the guidance here is extrapolated from its biology and from well-documented sand-dwelling utaka, and should be read as such.

The biology dictates the setup. This is an open-water, sand-floor shoaler, not a rock fish: it wants a long tank with a wide-open sand bed and swimming length far more than it wants caves and rockwork. Think a 6-foot footprint (roughly 125 US gallons / ~470 L and up) so males can space out and a small group can shoal, kept in a harem-leaning ratio of one male to several females to spread his attention. Water should match the lake — hard, alkaline (pH ~7.8-8.5), warm (around 24-27 °C), and very clean, since planktivores do poorly in nutrient-loaded water. Feed small, frequent meals of zooplankton-appropriate foods (cyclops, small frozen crustaceans, quality micro-pellets) aimed into the water column. Aggression is real but is the focused, arena-style sparring of breeding males rather than the relentless hostility of mbuna; the common mistakes are housing them too cramped, on the wrong substrate, with no room for a male to hold a territory without constant warfare. Not a beginner fish, and not one to buy on impulse.

Conservation

The IUCN Red List assesses Mchenga cyclicos as Near Threatened (criteria B1a+2a), in an assessment by Konings, Kazembe, Makocho and Mailosi dated 9 June 2018 (errata version 2019). That is a step down from the Vulnerable rating it carried in earlier assessments under the name Copadichromis cyclicos. The reasoning is tied to its tiny known range — a single location with an EOO of 240 km² — combined with exposure to fishing; the assessors note that continuing declines are possible but unconfirmed, and that the fish may be more widespread than the records show, which is why it lands at Near Threatened rather than a higher category. The named threat is overfishing with chirimila (utaka) nets, since this is a food fish, not an ornamental one; reassuringly, its range falls in or near Lake Malawi National Park. Population trend is listed as unknown.

That species-level picture sits inside a strained lake. The 2023 basin review by Chavula and colleagues in the Journal of Great Lakes Research catalogs the pressures bearing on Lake Malawi/Niassa/Nyasa: heavy and growing fishing effort and the well-documented collapse of the chambo (Oreochromis) fishery; rising sediment and nutrient loads washing off deforested, cultivated catchments; and a warming surface — on the order of +0.7 °C in shallow water — that strengthens stratification, suppresses the mixing that lifts nutrients into the photic zone, and so trims the lake's primary productivity. Invasive-species introductions are an added risk. For a shallow, sand-shore, near-shore planktivore like M. cyclicos, two of those threats land squarely: sedimentation degrades exactly the clear open-sand habitat its bowers and shoals depend on, and any climate-driven dip in plankton productivity strikes a fish that eats nothing but plankton. So the honest framing is this — the species itself is only Near Threatened and not heavily exploited, but it lives in a lake whose trajectory is the real concern.

Mchenga cyclicos

About this species