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Taxonomy & naming

Maylandia usisyae was described by Shan Li, Ad Konings, and Jay Stauffer Jr. in 2016, in their Zootaxa revision of the Pseudotropheus elongatus species group (Zootaxa 4168(2):353–381), the same paper that erected the new genus Chindongo and named seven new species. Before it had a formal name, the fish circulated in the hobby and in field guides as Metriaclima sp. 'elongatus usisya'.

The specific epithet is a toponym: usisyae is the genitive of Usisya, the lakeshore village near the type locality, where Stauffer collected the holotype (an adult male of about 75 mm standard length) on the first day of 1991. The genus honors Hans-Joachim Mayland (1928–2004), a German ichthyologist, aquarist and writer.

The genus name itself is a long-running source of confusion. The original authors placed the species in Metriaclima, and the IUCN assessment still uses Metriaclima usisyae. FishBase and Eschmeyer's Catalog of Fishes, however, treat Maylandia as the valid senior name and Metriaclima as a junior synonym, so the accepted binomial on those authorities is Maylandia usisyae. The two names refer to exactly the same fish; which you see depends on which taxonomic camp a source follows. The fish belongs to the mbuna, the rock-dwelling cichlids that make up one of the most explosively diverse branches of Lake Malawi's species flock.

Appearance

This is a small, distinctly elongate mbuna — the "elongatus" of its old working name was earned. Its diagnostic feature is a slim body: depth runs only about 26–31% of standard length, slenderer than nearly all other Maylandia, which typically measure 29–41%. Like all members of the genus it carries bicuspid teeth in the outer tooth rows and tricuspid teeth inside, the dental signature of an algae-comber.

Reported size depends on how it is measured and where the fish lives. The original description and FishBase give a maximum of about 7.5 cm (3 in) standard length; in total length, both the IUCN assessment and Ad Konings' field data put wild adults at roughly 10 cm (4 in). Aquarium specimens grow larger, with well-fed males reported to reach at least 14 cm (5.5 in) and females staying a centimeter or two smaller.

The sexes are easy to tell apart in breeding condition. Territorial males take on a yellow to mustard ground color with faint brownish or bluish barring, two pale blue-to-white bars across the forehead, and a light blue throat; the dorsal fin is yellow at the base and black distally with light blue lappets, and the egg-spotted anal fin is blue with five or six yellow ocelli. Females are far plainer — a dull brown with two or three faint dark bars. One honest caveat from the describers: female M. usisyae cannot be reliably separated by color from females of the closely related M. flavicauda, and the two species are best distinguished by the males' colors and by fine measurements of the snout and preorbital bone.

Range & habitat

Maylandia usisyae is a Lake Malawi endemic with one of the smallest documented ranges of any cichlid in the lake. It is known from only two nearby sites on the northwestern coast: a submerged feature called Tchinga Reef just off Usisya (about 11°15' S, 34°14' E) and the rocks at Mara Rocks a short distance away. The IUCN puts both its extent of occurrence and its area of occupancy at roughly 4 km².

Within those reefs it is a fish of the intermediate habitat — the transition zone where boulders give way to open sand or mud rather than the pure rock face favored by many mbuna. It occurs at moderate depth, generally between about 7 and 15 m (23–49 ft), and forages from the algae-covered surfaces of rocks, including the vertical faces and undersides of large boulders. Lake Malawi's rocky shallows are clear, warm, hard and alkaline year-round — broadly in the range of 24–28 °C (75–82 °F), pH around 7.7–8.6 — a stable chemistry that has shaped the mbuna's entire way of life. Because this species sits a little deeper than the shallowest rock-dwellers, it depends on good light penetration reaching its feeding rocks, a detail that becomes important to its conservation.

Ecology & diet

Like other Maylandia, M. usisyae is an aufwuchs feeder — "aufwuchs" being the dense felt of algae, diatoms, cyanobacteria and tiny invertebrates that coats sunlit rock. Rather than scraping the whole mat off the stone the way some mbuna do, it uses its bicuspid teeth to comb loose strands and material from the matrix, taking diatoms and soft filaments of cyanobacteria without tearing the firmly attached algae away. That combing action is part of what its slender, lightly armed jaw is built for.

Its diet is not purely vegetarian, however. Stomach-content surveys of the rocky-shore community by Ribbink and colleagues (1983) found a predominance of loose aufwuchs but also large quantities of plankton, and the species is reported to take suspended food in significant amounts when it is available. FishBase places it at a low trophic level of about 2.3, consistent with a mostly herbivorous browser. In community terms it is one of many small grazers partitioning the algal turf of the reef, occupying a slightly deeper, more sediment-influenced slice of habitat than the shallow rock specialists alongside it.

Behavior & breeding

M. usisyae is a maternal mouthbrooder, the reproductive mode shared across the mbuna. Males in breeding color hold territories centered on a burrow dug beneath a rock or a cave between boulders; these territories abut one another and breeding males may sit as little as a meter apart, so the species effectively breeds in loose colonies. Females are encountered singly or in small foraging groups, and a female carrying eggs typically slips away to hide solitarily among the rocks in shallow water.

Spawning takes place inside the male's shelter. As in other Maylandia, the female lays and quickly takes the eggs into her mouth, snapping at the egg-spot markings on the male's anal fin in the act that ensures fertilization. She then broods the clutch — a relatively small one of roughly 10 to 30 eggs — for about three to three and a half weeks before releasing free-swimming fry. Day to day the species is described as fairly mild for an mbuna: relatively calm within its own kind and generally peaceable toward other species, with aggression flaring mainly between males during spawning.

In the aquarium

This is an mbuna of fairly modest temperament, but it is still an mbuna, and it is not a beginner's community fish. It reaches the tank trade under names like "Usisya Elongatus" and "Yellow Mara Elongatus," and the species seen in shops generally traces to the Mara Rocks population. Plan for an aquarium of at least roughly 300 liters (about 75 US gallons) with a footprint no shorter than 120 cm (4 ft): the extra length gives a dominant male room to hold a territory without grinding subordinates and females into the glass.

The setup that suits it mirrors its wild home — plenty of rockwork with caves and hiding places, over a fine sand bed that lets a male excavate a spawning burrow. The standard mbuna stocking logic applies: keep one male with several females, or a larger group in a big enough tank, so aggression is diffused rather than focused on a single target. Water should be hard and alkaline (pH high 7s to mid 8s, temperature around 24–26 °C / 75–79 °F). Its mild streak makes it more forgiving than many Malawi rock cichlids, but the usual cautions hold: avoid mixing it with similar yellow Maylandia or Pseudotropheus that could hybridize, since females of related species can be near-impossible to tell apart, and don't read "peaceful" as "safe with delicate community fish." It is a captive-bred fixture in the hobby precisely because keepers value an mbuna that brings the genus's color without the worst of its belligerence.

Conservation

Maylandia usisyae is assessed by the IUCN as Critically Endangered (criteria B1ab(v)+2ab(v)), assessed in May 2018 with an errata version published in 2019. The listing is driven entirely by its tiny range: both extent of occurrence and area of occupancy are about 4 km² across two reefs, the population is estimated at only around 1,000 mature individuals, and a continuing decline is projected. The two threats named in the assessment are sedimentation and extraction for the ornamental-fish trade — the species is regularly collected for export and is of no interest to food fisheries. Because it lives a little deeper and depends on light reaching the algae it grazes, anything that clouds the water bears directly on its food supply, which makes sediment a pointed threat rather than a generic one.

Those local pressures sit inside a lake under broad strain. The basin review by Chavula and colleagues (2023, Journal of Great Lakes Research 49(6):102241) documents the Lake Malawi/Niassa/Nyasa system absorbing heavy sediment and nutrient loading from deforested, intensively farmed catchments, the long decline of the commercially vital chambo, roughly 0.7 °C of warming in the shallow water that strengthens stratification and reduces the mixing that fuels productivity, and the looming risk of invasive species. For a shallow-to-mid-depth rocky-shore endemic like M. usisyae, the catchment-erosion story is the one that matters most: silt smothering reefs and dimming the water directly undercuts the sunlit aufwuchs it eats and the clear rock it breeds on. The honest summary is that this is not a fish whose lake-wide abundance is collapsing — it is genuinely common on its two reefs — but a naturally pinpoint range leaves it with almost no margin, so localized sedimentation or over-collection at a single site could imperil the whole species.

Maylandia usisyae

About this species