Taxonomy & naming
Haplochromis coprologus was described in 2010 by Leendert Niemantsverdriet and Frans Witte, researchers continuing the Leiden-based (Naturalis) tradition of documenting Lake Victoria's haplochromine diversity that the Haplochromis Ecology Survey Team had established in the 1980s — in this case describing a form identified among the lake's partially recovering, ecologically reorganized haplochromine populations of the 2000s. The epithet combines Greek kopros ('dung, excrement') with a second element most plausibly related to -logos, together perhaps alluding to a detritus- or waste-associated feeding habit; the describers' precise intended construction is not confirmed in the sources available for this article. As with the great majority of Lake Victoria's several hundred haplochromine species, coprologus is retained within the broad genus Haplochromis by most modern treatments, pending a complete phylogenetic revision of the flock.
Morphology
A verified maximum length and detailed morphometric account specific to Haplochromis coprologus are not confirmed in the sources available here — data sparse. As in essentially the whole Lake Victoria flock, breeding males would be expected to carry more saturated colour and anal-fin egg-spot ocelli, with females and non-breeding fish plainer and more cryptic, but a species-specific colour description cannot be responsibly given without a verified primary source.
Habitat
Haplochromis coprologus is endemic to Lake Victoria, the vast, shallow equatorial lake shared by Tanzania, Uganda and Kenya. Specific figures for its depth range, water temperature or pH are not confirmed in the sources available for this article; broadly, Lake Victoria's surface waters run warm and alkaline, with typical values around 73–81 °F and pH 7.2–9.0, conditions shared by essentially the entire haplochromine flock. A precise account of the ecological guild and micro-habitat this species occupies within the lake is not available here and is not asserted.
Feeding
No confirmed gut-content study for Haplochromis coprologus is available in the sources consulted here. The epithet's likely construction (from Greek kopros, 'dung') suggests a detritivorous or even coprophagous feeding habit — a real, documented niche among some Lake Victoria haplochromine morphs that persisted through the Nile-perch crash by exploiting decomposing organic matter and waste material as more specialized food sources became scarce. This reading should be treated as an inference from the name rather than a confirmed dietary finding for this species.
Mating
No courtship behaviour has been documented specifically for Haplochromis coprologus. As in essentially the entire Lake Victoria haplochromine flock, mating would be expected to follow the classic polygynous, lek-like pattern: males establish and defend small display territories and court passing females using anal-fin egg-spots and nuptial colour, while females range more widely and choose among displaying males, with no pair bond formed. This account is drawn from flock-wide biology rather than from direct observation of the species.
Breeding
Haplochromis coprologus is presumed, on flock-wide grounds, to be a maternal (female-only) mouthbrooder, the reproductive mode essentially universal among Lake Victoria haplochromines: the female takes the fertilised eggs into her mouth immediately after spawning and incubates them alone for roughly two to three weeks before releasing free-swimming fry, receiving fertilisation via the male's anal-fin egg-spot display. No clutch size or species-specific breeding record for H. coprologus is confirmed in the sources available here — data sparse.
In the aquarium
Haplochromis coprologus has no documented, established history in the aquarium hobby comparable to the handful of Lake Victoria haplochromines — Pundamilia nyererei among them — that entered the trade and conservation breeding programmes before or during the lake's ecological collapse. No species-specific husbandry guidance can be responsibly given for H. coprologus without better-sourced information, and prospective keepers should not assume it is available in captivity.
Conservation
The CARES Preservation Program lists Haplochromis coprologus as Critically Endangered. A specific IUCN Red List assessment for this species is not independently confirmed in the sources available for this article, but its listing sits within the best-documented modern vertebrate mass-decline event: from the late 1970s the introduced Nile perch (Lates niloticus) erupted across Lake Victoria, and over the following decade some 200 or more endemic haplochromine species disappeared or collapsed to a fraction of their former abundance. That predation pressure combined with severe human-driven eutrophication to devastate the flock as a whole. Notably, this species was only described in 2010, among generalist and detritivorous morphs that appeared to persist or re-emerge during the lake's partial post-crash recovery — yet even guilds that seemingly weathered the initial collapse remain, on the evidence of this listing, genuinely at risk from the compounded, ongoing pressures of eutrophication and fishing effort. Several of the flock's species now survive mainly through documented aquarium maintenance programmes rather than robust wild populations — precisely the situation the CARES model exists to hedge against.