Taxonomy & naming
The species was described by the Belgian-British ichthyologist George Albert Boulenger in 1907, in one of his many papers on fish collections sent to the British Museum from colonial Southern Rhodesia (present-day Zimbabwe). The material had been gathered by Charles Francis Massy Swynnerton (1877–1938), a British-born naturalist, entomologist and forester who spent much of his career in Rhodesia and later Tanganyika, and who supplied specimens of birds, insects and fish to specialists in London; a number of African species across several groups carry his name in recognition of that collecting work. Boulenger's original combination is understood to have placed the fish in the genus then used for African cichlids of this general form; it was subsequently transferred to Astatotilapia, the broad genus of generalized, small-to-medium mouthbrooding haplochromines that P. H. Greenwood consolidated in his 1979 revision of the Haplochromis group to absorb the many similar riverine cichlids scattered across Africa outside the great lakes. Astatotilapia in this sense also contains the widely studied model species A. burtoni, and swynnertoni is best understood as one of the genus's many regional, generalist representatives rather than as part of a lake-flock radiation.
Morphology
Detailed morphometric data specific to Astatotilapia swynnertoni are not confirmed in the sources available for this article, and a precise maximum length has not been independently verified here — data sparse. In common with other Astatotilapia, it is expected to show the typical generalized haplochromine build: a moderately elongate, laterally compressed body, a terminal, unspecialized mouth suited to a broad diet, and the sexual dimorphism characteristic of the genus, with breeding males carrying more intense colour and the anal-fin egg-spots (ocelli) used in courtship, while females and non-breeding fish remain comparatively drab and cryptic. Readers should treat any specific colour description as provisional pending direct confirmation against primary literature.
Habitat
Astatotilapia swynnertoni is a riverine cichlid of south-eastern Africa, associated with the plateau river systems of the Zimbabwe–Mozambique borderlands from which Swynnerton's original collections were made. Like most Astatotilapia, it is expected to occupy slow-flowing river reaches, floodplain pools and vegetated margins rather than open, fast water or deep lacustrine habitat — the generalist niche typical of the genus across the continent. Specific, sourced figures for temperature, pH or depth range are not available for this pass and are not asserted here; prospective keepers and researchers should consult primary regional ichthyological surveys before relying on any inferred water-chemistry values.
Feeding
No species-specific dietary study is confirmed in the sources available here. Astatotilapia as a genus are opportunistic omnivores, taking a mix of aquatic invertebrates, algae, detritus and plant material according to what is locally available — a flexible feeding strategy that likely explains the genus's wide distribution across African river systems. Astatotilapia swynnertoni is presumed to follow this general pattern, but the claim is inferential rather than directly documented for this species.
Mating
No courtship behaviour has been documented specifically for Astatotilapia swynnertoni. Across the genus, mating follows the classic haplochromine pattern: males are polygynous, establishing and defending small display territories that they advertise to passing females rather than forming pair bonds, with the anal-fin egg-spots playing a central role in triggering the female's spawning and fertilisation sequence. This account is drawn from genus-typical biology rather than from direct observation of the species.
Breeding
Astatotilapia swynnertoni is presumed, on genus-wide grounds, to be a maternal (female-only) mouthbrooder, the reproductive mode found throughout Astatotilapia and the wider haplochromine radiation: the female takes the fertilised eggs into her mouth immediately after spawning and incubates them without male assistance until the fry are free-swimming. No clutch size, incubation period or captive-breeding record specific to this species is confirmed in the sources available here — data sparse.
In the aquarium
Astatotilapia swynnertoni has no established, documented history in the aquarium hobby comparable to its well-known relative A. burtoni, and specific husbandry guidance for this species cannot be responsibly given without better-sourced information. Riverine Astatotilapia in general tend to be hardy, adaptable and easy to feed, tolerating a range of moderate, neutral-to-slightly-alkaline water conditions, but any keeper encountering this species should treat conditions as provisional and verify against dedicated species reports rather than generic genus assumptions.
Conservation
Astatotilapia swynnertoni is listed by the CARES Preservation Program as Vulnerable, a category CARES applies to species facing a documented or strongly suspected decline that has not yet reached a more severe threshold. A specific IUCN Red List assessment for this species is not independently confirmed in the sources available for this article. Its inclusion in CARES is consistent with the broader pattern among southern and south-eastern African riverine cichlids outside the major rift lakes: these are often narrow-range or poorly surveyed species whose river systems face pressure from damming, agricultural runoff, siltation and the spread of non-native fish, yet which receive far less research and conservation attention than their counterparts in Lakes Victoria, Malawi and Tanganyika. Maintaining a documented, traceable aquarium population — the purpose of the CARES listing — is a hedge against exactly that gap in wild monitoring.