Taxonomy & naming
Mormyrops curtus was described by the Belgian-British ichthyologist George Albert Boulenger in 1899, part of the same wave of Congo basin fish descriptions that produced dozens of the region's mormyrids around the turn of the twentieth century. It belongs to the family Mormyridae within the order Osteoglossiformes — the bonytongues, an ancient teleost lineage named for a toothed bone on the floor of the mouth that bites against a toothed plate on the roof of the mouth, and one that split into a scattered, deep-time radiation across South America, Africa, southeast Asia and Australasia long before most modern fish families existed. The Old World featherback knifefishes (family Notopteridae) belong to this same order; the visually similar electric knifefishes of South America (Gymnotiformes) do not — that resemblance is convergent, not close kinship.
The genus Mormyrops is one of roughly twenty genera in Mormyridae and, unlike some long-snouted relatives that are reliably told apart only by their electric organ discharge (EOD), its members are usually distinguishable by conventional body and head proportions as well. The genus name combines mormyrus, the old fish name that also underlies the family name Mormyridae, with the Greek suffix -ops, "appearance, face" — together, "Mormyrus-like". The species epithet curtus is Latin for "short", here describing the relatively short, deep body of this species compared with more elongated congeners. Catalog of Fishes (Eschmeyer, CAS) treats Mormyrops curtus as the currently valid name.
Morphology
Mormyrops curtus has the broad head, blunt snout and robust, laterally compressed body typical of its genus, without the trunk-like chin appendage (the schnauzenorgan) that marks Gnathonemus or the down-curved snout of Campylomormyrus — Mormyrops species instead have a comparatively large mouth positioned for a more generalist, sometimes predatory diet. As its epithet suggests, the body is proportionally shorter and deeper than in many other mormyrids, giving it a stockier profile. The single dorsal fin sits well back on the body opposite a long-based anal fin, and the caudal fin is deeply forked, in keeping with the standard elephantnose fin plan. FishBase records a maximum size of 15.7 in total length for males and unsexed individuals, making this a mid-sized member of a genus whose largest species can approach a metre and a half.
As in all mormyrids, a weakly electric organ in the caudal peduncle generates a continuous, species-specific pulse-type electric organ discharge (EOD), sensed across the skin by dedicated electroreceptors. Processing that constant electrosensory stream is handled by a greatly enlarged cerebellum, which is why mormyrids as a group post some of the highest brain-to-body-mass ratios of any fish — a genuine "thinking fish" adaptation for reading a dark, low-visibility world electrically rather than visually.
Habitat
Mormyrops curtus is a Congo River endemic, recorded from the lower Congo, Pool Malebo (Stanley Pool) and the middle Congo River in the Democratic Republic of the Congo. FishBase lists it as demersal, living and foraging over the river bottom rather than in open water, in warm tropical conditions around 72–75 °F.
Water chemistry data for this species is limited to a reported pH around 5.0 — distinctly soft and acidic — with no confirmed upper bound in the sources reviewed here. That fits the general pattern for Congo basin river and floodplain habitats, which run soft, mineral-poor and often tannin-stained or turbid with suspended sediment: the dim, low-visibility water in which an electric sense for navigation and prey-detection is a genuine advantage over eyesight alone. A precise pH range beyond that single data point should not be assumed.
Feeding
Detailed feeding data specific to Mormyrops curtus is sparse in the sources reviewed here, but the genus Mormyrops is generally understood to be more predatory than the smaller, invertebrate-probing elephantnoses: its members forage over and near the bottom for aquatic invertebrates and, in the larger species, small fish, relying on electrolocation to find prey in murky water where vision is of limited use. As a demersal fish with a comparatively large mouth for its genus, M. curtus most plausibly follows this same generalist, bottom-oriented foraging pattern, though the point should be treated as inference from genus-level biology rather than a documented account for this exact species.
In the aquarium, mormyrids of this kind are typically weaned onto frozen bloodworm, mysis shrimp and other meaty foods once settled, and — as with most mormyrids — tend to feed most actively after dark. Newly imported specimens are often reluctant feeders that need time and a calm, uncrowded tank before they will take food reliably.
Mating
Wild reproductive behaviour has not been documented for Mormyrops curtus in the sources reviewed here. As in mormyrids generally, courtship is thought to be mediated substantially through the electric organ discharge: species- and sex-specific variation in the EOD is believed to help mormyrids recognise appropriate mates and signal reproductive condition in water too dark or turbid for visual courtship to work reliably.
Beyond that electrical role, almost nothing concrete is known about how, when or where this species pairs or spawns. Mormyrids as a family are generally believed to be seasonal spawners cued to the rainy-season flood pulse of their rivers, but no species-specific account of that cycle exists for M. curtus in the sources available, and any more detailed claim about courtship display or spawning site would be speculation rather than fact.
Breeding
Mormyrops curtus is essentially unknown to have been bred in the aquarium. Captive breeding across the mormyrid family as a whole is rare and poorly documented, and this species — a demersal, moderately sized Congo endemic with only occasional presence in the trade — has no established aquarium breeding protocol in the sources reviewed here. As with most of its relatives, its reproduction is best summarised as a seasonal, flood-triggered event in the wild about which the details remain largely unrecorded, rather than a process aquarists can currently replicate on purpose.
Parental care, if any exists in this species, is not described anywhere in the literature reviewed and should be treated as unknown rather than assumed. Prospective keepers should not expect to breed this fish and should plan around wild-collected stock.
In the aquarium
Mormyrops curtus does appear in the aquarium trade from time to time, and general elephantnose care guidance describes species in this genus as needing soft, acidic, warm tropical water and a demersal, bottom-oriented setup with dim lighting and plenty of cover to retreat to during the day — conditions that mirror its Congo basin origins rather than a hard, alkaline or brightly lit tank. Like other mormyrids it is sensitive to poor water quality and, being a scaleless-skinned electric fish, to some medications; copper-based treatments in particular should be avoided or used only with great caution.
Captive breeding data for this species is limited, and general mormyrid husbandry experience suggests caution with conspecifics and similarly built tankmates, since many members of this family can be territorial or intolerant of their own kind in a confined aquarium — a single specimen, or a very large tank with ample sight-breaks, is the safer approach absent species-specific guidance. At up to around 15.7 in total length it is not a small fish and should be sized for accordingly, though it falls well short of the largest Mormyrops species, which can approach a metre and a half.
Conservation
The IUCN Red List assesses Mormyrops curtus as Least Concern, per its most recent (2022.2) assessment cycle. FishBase similarly reports low to medium vulnerability to fishing pressure and a medium capacity for population recovery, consistent with a widespread, unthreatened status rather than an active decline.
As a Congo basin endemic restricted to the lower and middle Congo River and Pool Malebo, its longer-term outlook is tied to the health of that river system — sedimentation, damming, water-quality pressure and fishing intensity are the generic threats facing Congo basin fish communities generally — but nothing in the sources reviewed here points to a specific documented threat to this species beyond its current Least Concern status.