Taxonomy & naming
Tropheops sp. "Lumessi Blue" has no formal scientific name. The trade name combines "Lumessi," a reef site within the Meponda area of the Mozambican Lake Malawi shore, with "Blue," describing the body colouration of mature males. It is placed in Tropheops on the strength of the genus's diagnostic blunt head and comb-like, obliquely implanted outer teeth used to scrape algae from rock. The Mozambican shore of Lake Malawi is comparatively less intensively surveyed than the Malawian side, and no published work has formally compared this population against the many named Tropheops trade forms recognised from the Malawian coast, so its closest relative within the genus cannot be stated with confidence.
Morphology
A compact, blunt-headed mbuna on the standard Tropheops build, with thick lips and the genus's characteristic comb-like rows of outer teeth. The trade name identifies mature males by a blue body colouration, a pattern documented broadly across the genus and typically representing the fully mature endpoint of the standard Tropheops colour progression from a barred juvenile pattern to a more solidly coloured adult male dress. Beyond this diagnostic blue colouration, a full account of the form's fin markings or female colouration has not been published. Genus-typical size for Tropheops is roughly 3.5–4.5 in total length for adult males; no formal measurements have been published for this specific population.
Habitat
This form is documented from Meponda on the Mozambican shore of Lake Malawi, in the central-eastern part of the lake. As with other Tropheops, it is expected to hold territories on rock in the intermediate zone between pure rock and open sand. Water conditions in this part of the lake follow the standard Malawi profile: temperatures in the mid-20s Celsius and pH on the alkaline side of neutral. No precise depth record has been published for this population specifically, and the comparatively limited survey coverage of the Mozambican shore means its full distribution beyond the Lumessi site is uncertain.
Feeding
Tropheops sp. "Lumessi Blue" grazes aufwuchs — the mixed film of algae, diatoms, and associated micro-invertebrates coating sunlit rock — using the genus's comb-like outer teeth to scrape material loose. This is the standard feeding mode across Tropheops and most rock-dwelling mbuna, tying the fish to algae-productive rock surfaces in the shallow to intermediate zone. Territorial males defend patches of productive turf as both a feeding resource and a display site.
Mating
Breeding follows the standard mbuna pattern of male territoriality and female choice. Dominant males hold and defend small territories on rock, where they display their blue breeding colouration to attract passing females. There is no pair bond, and a successful male may spawn with several females visiting his territory over time. No mating study specific to this population has been published; this account follows the well-documented pattern shared across Tropheops.
Breeding
As in all Lake Malawi cichlids, breeding is by maternal mouthbrooding. After courtship at the male's territory, the female releases a small number of eggs and takes them into her mouth almost immediately; she is drawn to the egg-spot markings on the male's anal fin and, in mouthing at them, takes in sperm that fertilises the clutch already held in her mouth. She then broods the eggs and larvae for roughly three to four weeks without feeding significantly, releasing free-swimming fry that receive no further parental care. Clutch size has not been documented for this form; by analogy with similarly sized Tropheops it is likely modest, on the order of a few dozen eggs.
In the aquarium
Tropheops sp. "Lumessi Blue" is uncommon in the hobby, and no dedicated husbandry record specific to this population is available. General Tropheops care applies: a rock-dominated tank with a base of fine sand, arranged into distinct piles with clear sightline breaks so a dominant male's territory does not extend across the whole tank. A footprint of at least 47 in is a sensible minimum for a harem group.
Water should mirror Lake Malawi conditions: temperature in the mid-20s Celsius, pH roughly 7.7-8.6, and moderately hard to hard water, held stable. Diet should lean vegetable — a spirulina-based flake or pellet as the staple, with only occasional protein-rich foods, since a high-protein diet is strongly linked to bloat in this group. One male to several females is the standard stocking ratio; a lone male without enough females to spread his attention will harass tankmates.
Conservation
Tropheops sp. "Lumessi Blue" has not been evaluated by the IUCN and, as an undescribed form without a formal scientific name, has no Red List assessment. It is currently documented from a single reef site on the Mozambican shore, an area of the lake with comparatively less survey coverage than the Malawian side; its true range may extend further than the records show. No conservation status should be attached to it pending both a taxonomic description and further field survey.