Taxonomy & naming
Otopharynx sp. "Golden Blueface" has no describing author, no publication date, and no entry under a validated name in Eschmeyer's Catalog of Fishes; it is an informal trade name, not a scientific one. The genus Otopharynx (Regan, 1920) is diagnosed largely by features of the pharyngeal jaw and by a melanic pattern of discrete flank blotches, but in the aquarium trade its many undescribed forms are more often labelled by breeding-male colour, as here: a golden body paired with a contrasting blue face, a combination also seen informally in other Malawi haplochromine genera. No published study has established which described Otopharynx species this Ikombe population is most closely allied to, and it should be treated as a distinct, unresolved entity pending that work.
Morphology
As its trade name records, breeding males of this form are reported to show a golden body colour with a contrasting blue face — likely including the head and possibly the anterior flank, in the manner of similarly named forms in other genera. Beyond that documented colour cue, no formal morphometric study has been published for this population. The body should be expected to follow the moderately deep, laterally compressed shape typical of the genus, with genus-typical size for a mid-sized Otopharynx running to roughly 4.5–6 in total length. Females are expected to be plainer, silvery and less conspicuously marked than the golden-and-blue males, in keeping with the wider haplochromine pattern of the lake.
Habitat
The form is recorded from Ikombe, a village on the Tanzanian shore of northern Lake Malawi, a locality documented in the field literature on the lake's northern endemics. Otopharynx species generally occupy the sand-rock interface or open sand rather than dense rocky reef, foraging and breeding at moderate depths, and this is presumed to hold for the Ikombe population as well. The surrounding water is warm, alkaline and well-buffered, consistent with Lake Malawi's littoral zone throughout, though the precise depth range used by this specific form has not been documented.
Feeding
Otopharynx species span a range of feeding strategies, from open-water zooplankton feeders to more benthic invertivores picking prey from sand or rock. Which strategy applies to Otopharynx sp. "Golden Blueface" has not been documented directly, but its association with the sand-and-rock habitat typical of the northern lake makes a benthic or sand-associated invertivorous diet — small crustaceans, insect larvae and other invertebrates picked from the substrate — the more likely pattern, consistent with several of the genus's sand-zone species.
Mating
Breeding behaviour has not been documented specifically for this form. By analogy with other Otopharynx and the wider Lake Malawi haplochromine assemblage, males in golden-and-blue breeding colour are expected to hold a territory — on rock, sand, or the interface between the two — and display to attract passing females, following the general haplochromine courtship pattern built around egg-spot markings on the male's anal fin. No locality-specific field account of courtship exists for this form.
Breeding
As in all Lake Malawi haplochromines, reproduction is by maternal mouthbrooding: the female carries the fertilised eggs and subsequent fry in her mouth, without normal feeding, for several weeks until they are ready for independent release, with the male taking no further role after spawning. Clutch size and brooding duration have not been documented for this specific form; genus-typical figures for mid-sized Otopharynx suggest a modest clutch and a brooding period of several weeks.
In the aquarium
Otopharynx sp. "Golden Blueface" is an uncommon fish in the hobby, generally reaching keepers through specialist Malawi cichlid importers working the northern-lake export points, including the Tanzanian shore. A tank for it should provide a sand substrate along with moderate rockwork, reflecting its likely sand-rock interface habitat, and open swimming space. Water chemistry should follow the Lake Malawi standard — alkaline and well-buffered, pH roughly 7.7 to 8.6, temperature 75–82 °F. Otopharynx species are generally less aggressive than rock-dwelling mbuna and are usually kept successfully alongside other calm, similarly sized Malawi haplochromines. Diet should include a quality cichlid pellet supplemented with small live or frozen invertebrates such as bloodworm and brine shrimp.
Conservation
Otopharynx sp. "Golden Blueface" has not been evaluated by the IUCN and, as an undescribed form, has no Red List status of any kind. Its documented range is a single locality, Ikombe, on the Tanzanian shore of Lake Malawi, but no population assessment or targeted study has been published for this specific form. In the absence of that data, the honest position is that it is unassessed, and that a form known from a single locality warrants the same general caution applied to other narrow-range Malawi endemics.