Taxonomy & naming
Cynotilapia sp. "Zebra Deep" has never been formally described, has no describing author or publication date, and does not appear under a validated name in Eschmeyer's Catalog of Fishes. "Zebra" is used informally within Cynotilapia trade nomenclature for forms with a blue, black-vertically-barred pattern — the same term applied to the well documented C. sp. "Chinyankwazi" form, whose coloration Ad Konings has described as almost identical to that of Maylandia (formerly Pseudotropheus) zebra. "Deep" further marks this as a population collected below the shallow reef zone typical of most documented mbuna. Three Peaks Reef also hosts a second named Cynotilapia colour form, sp. "Deep Skov", a pattern of multiple congeneric forms partitioning a single reef that is characteristic of Lake Malawi's fine-grained mbuna speciation.
Morphology
The colour cue carried in this form's own name is a blue, black-vertically-barred ("zebra") pattern, comparable to that documented for C. sp. "Chinyankwazi" elsewhere in the lake, though the specific bar count and shade recorded at Three Peaks Reef have not been published in the sources available for this article. It should carry the genus's diagnostic single row of unicuspid, dog-like teeth in each jaw and the compact, moderately elongate body typical of small Cynotilapia. Genus-typical size runs to roughly 3–3.5 in total length, males larger than females.
Habitat
Three Peaks Reef lies in the southern portion of Lake Malawi and supports at least two named Cynotilapia colour forms — sp. "Zebra Deep" and sp. "Deep Skov" — a pattern consistent with the lake's characteristic fine-grained mbuna speciation, in which a single reef can host multiple closely related but visually distinct populations partitioned by microhabitat or depth. "Zebra Deep" is recorded below the shallow snorkel-depth zone most rock-dwelling mbuna occupy, likely in the range of roughly 49–115 ft based on comparable deep-water mbuna records elsewhere in the lake, though no formal depth survey has been published for this specific population. Water chemistry follows Lake Malawi's standard rocky littoral profile — warm, alkaline, and well-buffered.
Feeding
Cynotilapia's diagnostic unicuspid "dog-tooth" dentition sets its feeding apart from most other mbuna, which use closely packed bicuspid or tricuspid teeth to scrape tightly bound algal turf directly off rock. Cynotilapia species instead pick loose diatoms, filamentous algae, and fine organic detritus from rock and sand surfaces. "Zebra Deep" is presumed to follow this genus-wide pattern; at the depth this population occupies, light-limited algal growth is likely thinner than in the shallow reef zone, which may push it toward a somewhat greater reliance on picked detritus and small invertebrates, though this has not been directly studied for this form.
Mating
No breeding behaviour has been documented specifically for "Zebra Deep". The genus follows the standard mbuna pattern seen throughout Lake Malawi's rocky shore: mature males establish and defend a small territory, often no more than a patch of rock or a shaded crevice, and display to passing females in breeding colour rather than building a nest. Cynotilapia territories tend to be smaller and less fiercely contested than those of larger mbuna genera such as Maylandia or Petrotilapia. Courtship follows the typical haplochromine sequence, with a receptive female circling a displaying male and spawning with him over open substrate.
Breeding
As in every Lake Malawi haplochromine, reproduction is by maternal mouthbrooding. The female takes fertilised eggs into her mouth immediately after spawning and carries them, without feeding normally, until the fry are large enough to be released as free-swimming young; the male provides no further care. Clutch sizes in small Cynotilapia species are modest, typically a few dozen eggs, and the brooding period runs roughly three to four weeks in the genus generally. None of these specifics have been confirmed for the Three Peaks Reef population itself, so the figures given here are genus-typical expectations rather than documented measurements.
In the aquarium
"Zebra Deep" reaches the hobby only occasionally, given both the narrow reef it comes from and the greater difficulty of collecting fish from depth compared with shallow reef mbuna. Where it is kept, standard small-mbuna husbandry applies: abundant rockwork arranged into caves and broken sightlines, a sand substrate, and water matching Lake Malawi's rocky zone — alkaline, well-buffered (pH roughly 7.7–8.6), and warm (75–82 °F). A tank of at least 39.5–47 in footprint suits a group kept as one male with several females, since male aggression, while milder in this genus than in many mbuna, is still present. Diet should lean vegetable, a spirulina-based flake or pellet supplemented sparingly with small invertebrates, with fatty, protein-heavy foods avoided given the genus's general susceptibility to Malawi bloat.
Conservation
"Zebra Deep" has not been evaluated by the IUCN and, as an undescribed form with no formal scientific name, carries no Red List status — an absence of assessment, not a statement of safety. The documented range is limited to a single reef in the southern lake, and depth alone does not shield a population from over-collection pressure specific to the aquarium trade, since deep mbuna forms attract targeted collecting precisely because of their rarity. No specific population threat has been documented for this form, but its narrow known range is grounds for caution in how heavily the reef is collected.