Taxonomy & naming
Pseudotropheus likomae belongs to Pseudotropheus, the founding genus of Lake Malawi's mbuna — small, aggressive, algae-grazing rock cichlids — a genus that has been progressively narrowed as related species groups were split into genera such as Maylandia, Metriaclima, Tropheops, and Chindongo over recent decades of taxonomic revision. Eschmeyer's Catalog of Fishes is the reference for the currently accepted describing authority and date for this species, not restated here to avoid an inaccurate citation. The species epithet likomae is a straightforward Latin genitive locality name, meaning simply "of Likoma," after Likoma Island, the type locality and namesake for the species.
Morphology
Pseudotropheus likomae follows the standard mbuna body plan: an elongate, laterally compressed, moderately deep body with a small terminal mouth carrying fine, closely packed teeth adapted for scraping algae from rock. Precise published length figures are not confidently known here; comparably built Pseudotropheus mbuna typically reach roughly 3–4.5 in total length. Sexual dichromatism is expected, following the common mbuna pattern of more strongly coloured or barred breeding males contrasted with duller, often more cryptic females.
Habitat
The species is documented from Likoma Island and the nearby Ndomo Point, both in the far northern part of Lake Malawi. Likoma is the larger of two Malawian islands lying within what is otherwise Mozambican lake territory, an enclave with extensive rocky shoreline. As with all mbuna, the species is confined to the shallow rocky littoral zone, where dense algal growth on boulders and reef provides both food and cover. Water conditions follow the standard Lake Malawi profile — warm, alkaline, and well-buffered, broadly in the mid-20s Celsius with a pH on the alkaline side of neutral, typically in shallow-to-moderate depths.
Feeding
As a mbuna, Pseudotropheus likomae is expected to be primarily an aufwuchs grazer, biting the algae-and-diatom mat from rock surfaces — a largely plant-based, fibrous diet shared across the tribe. No species-specific dietary study is documented here, so this account reflects the general feeding ecology of Pseudotropheus and the mbuna rather than a confirmed study of this particular species.
Mating
Reproduction is expected to follow the standard mbuna pattern of polygyny without pair bonding: territorial males hold and defend patches of rock, displaying in breeding colour to attract females that move between territories rather than pairing with a single male. No courtship study specific to P. likomae is documented here; this account reflects the general breeding biology shared across Pseudotropheus and the mbuna community.
Breeding
Pseudotropheus likomae is presumed to be a maternal mouthbrooder, as are all mbuna. After spawning at a male's rocky territory, the female takes the fertilised eggs into her mouth and broods them alone, typically for roughly three weeks, before releasing free-swimming fry with no further parental care from the male. Clutch size and brooding duration are not documented for this species specifically; comparably sized mbuna typically produce clutches on the order of a few dozen eggs.
In the aquarium
Pseudotropheus likomae does not have a well-documented presence in the aquarium hobby; specific keeping notes are not available here. Husbandry would be expected to follow the standard template for a rock-dwelling mbuna: dense rockwork furnishing to break sightlines and diffuse aggression, alkaline water buffered into the high 7s to high 8s pH range, and a diet centred on spirulina- or algae-based foods rather than protein-rich fare, which is linked to bloat in this group. As with most mbuna, managing intraspecific aggression favours either a single specimen or a crowded group over a small handful of individuals.
Conservation
No confident IUCN Red List status is available for Pseudotropheus likomae and none is asserted here. As a species tied to Likoma Island's rocky shoreline, an isolated Malawian enclave within Mozambican waters, it would potentially have a fairly restricted range and would be exposed to the general pressures affecting Lake Malawi's littoral reef habitat — ornamental collection, inshore sedimentation, and cumulative fishing pressure — but no formal population assessment is documented in the sources consulted for this article.