Taxonomy & naming
Maylandia sp. "Mbweca" is undescribed: there is no published diagnosis, holotype, authority or year attached to it, and none should be invented. The trade name is built directly from its collection point, Mbweca Rocks, a site on the Mozambique shore of Lake Malawi also associated with several other mbuna trade forms across different genera. As with most locality-named Maylandia, its relationship to the described species in the genus, and to other undescribed populations sharing similar names elsewhere in the lake, has not been resolved, and this account does not assert a closer relationship than the shared genus.
Morphology
Maylandia sp. "Mbweca" shares the compact, laterally compressed zebra-mbuna body plan and comb-like bicuspid dentition typical of the genus. No published morphometric description or colour account exists for this specific population, and no colour trait is implied by its plain locality-based name, so this account does not assign it a specific pattern beyond noting that, as in other Maylandia, males and females are expected to differ in colour, with males typically the more brightly marked sex.
Habitat
This form is documented from Mbweca Rocks on the Mozambique shore of Lake Malawi. As with other rock-dwelling Maylandia, it is expected to be confined to rocky and rock-sand transition habitat rather than open sand or deep water, in the hard, alkaline water typical of the entire lake.
Feeding
No feeding study specific to this population has been published. Like other Maylandia it is presumed to graze aufwuchs, the algae and diatom film coating sunlit rock, scraping it loose with the fine, densely packed teeth characteristic of the genus and taking small invertebrates from within that film opportunistically.
Mating
Mating behaviour has not been documented for this population specifically. Maylandia generally follow the standard lek-like mbuna system: males hold and defend small rock or cave territories without pair bonding, displaying to and courting ripe females that enter the territory.
Breeding
Reproduction follows the standard Maylandia pattern of maternal mouthbrooding: the female takes the fertilised eggs into her mouth after spawning and broods them alone, typically for three to four weeks, before releasing free-swimming fry with no further parental involvement from either parent. Clutch size for this population specifically has not been documented.
In the aquarium
This form is not established in the general aquarium trade under this name, and no dedicated husbandry record exists for it. Were it kept, care would follow standard Maylandia husbandry: a long tank with dense rockwork offering multiple broken sightlines and cave territories, hard alkaline water in the mid-20s Celsius, and a vegetable-forward, spirulina-based diet, with high-protein foods minimised given the genus's susceptibility to Malawi bloat.
Conservation
Maylandia sp. "Mbweca" has not been evaluated by the IUCN Red List, and as an undescribed form it is not currently eligible for formal assessment. Its documented range is a single reef, and no dedicated survey of collecting pressure or habitat condition there has been published, so its status is best described as unevaluated and effectively unknown.