Cichlid Atlas — the world's cichlid waters, in depth

Taxonomy & naming

The species was described in 1952 by Ethelwynn Trewavas and Max Poll as Lamprologus pleuromaculatus, from material collected at Usumbura (now Bujumbura, Burundi) at the northern tip of Lake Tanganyika; the holotype is held at the Natural History Museum in London (BMNH 1950.4.1.7453). The specific epithet is a straightforward Latin-Greek compound — pleuro- ("side, flank") plus maculatus ("spotted") — and it earns the name: rows of dark blotches run along the body.

Its genus has been a moving target. Through the late twentieth century it was reassigned to Neolamprologus, the name still used by FishBase and the GBIF taxonomic backbone, and that combination is the one most aquarists encountered. But more recent treatments — Ad Konings in 2015 and 2019 — place it in Lepidiolamprologus, and Eschmeyer's Catalog of Fishes lists the current valid name as Lepidiolamprologus pleuromaculatus (Trewavas & Poll, 1952). We retain the widely searched "Neolamprologus" label here for continuity, but the fish belongs with the Lepidiolamprologus predators.

That genus is a tight cluster of elongate, large-mouthed piscivores within the tribe Lamprologini — the substrate-spawning flock that makes up roughly half of Tanganyika's cichlid species. Poll's 1986 classification grouped the big predators (elongatus, attenuatus, profundicola, kendalli, nkambae and others) by shared features such as high lateral-line scale counts; molecular work by Schelly and colleagues in 2006 refined the group's boundaries and showed that one historical member, L. cunningtoni, is not closely related to the rest.

Appearance

This is a slim, torpedo-shaped fish built for the chase: a long body, a pointed head, and a notably large mouth — the standard toolkit of a lamprologine predator. Reported maximum size is modest for the genus. FishBase lists 12 cm (4.7 in) total length, and the Tanganyika reference site tanganyika.si gives a typical adult length of about 11 cm (4.3 in), with males larger than females. That makes it one of the smaller members of a genus whose giants (L. elongatus, L. profundicola) reach 30 cm (12 in) or more.

Coloration is understated — a tan-to-grey ground broken by the rows of dark flank spots that give the fish its name, with subtle markings carried into the fins. The sexes look alike apart from size. Its closest look-alike is Lepidiolamprologus attenuatus, and telling the two apart is genuinely difficult in the tank; reported distinctions include a stockier body and blunter snout in pleuromaculatus, stronger fin markings, a higher count of scales in the longitudinal series (over 60, reported around 66-73), and more gill rakers (roughly 13-17, versus under 12 in attenuatus).

Range & habitat

Neolamprologus pleuromaculatus is a Lake Tanganyika endemic with a tight distribution: it is restricted to the northern end of the lake, generally the northern quarter, north of the Ubwari Peninsula. It is documented from Burundi (the Bujumbura area) and from northwestern localities such as Luhanga on the Congolese shore, with records also pointing to the northeastern side around Nyanza-Lac. This is a small range even by the standards of Tanganyika's notoriously micro-distributed cichlids.

Unlike the deep-water giants of its genus, this is a shallow-water fish of the littoral. It favours sediment-rich rocky and intermediate (rock-meets-sand) habitats and is also found over soft sandy or muddy bottoms close to shore, with reports extending down to roughly 40 m (130 ft). The water it lives in is hard and alkaline, as everywhere in Tanganyika: FishBase records a pH range of about 7.5-8.5, carbonate hardness from 15 dH upward, and temperatures around 23-25 C (73-77 F). It is worth noting that some populations along the Congolese coast appear more slender and may represent a distinct, related taxon — a reminder that the lake's predator complex is still not fully resolved.

Ecology & diet

This is an unambiguous carnivore. In the wild it preys on small animals — chiefly small fishes and the fry of other cichlids, and it is repeatedly noted as a raider of shell-dweller young, the easy meals that congregate around the lake's empty Neothauma snail shells. FishBase places it at a trophic level of about 3.6, consistent with a small piscivore that also takes invertebrates.

In this it plays the role its whole genus is built for. Lepidiolamprologus are Tanganyika's archetypal lamprologine predators — slim, big-jawed hunters that stalk over the rocky and intermediate zones picking off smaller fish. One congener, L. mimicus, takes the strategy to an extreme: described in 2007 as the first known case of aggressive mimicry among lamprologines, it shifts its colour pattern to blend into schools of yellow-finned Cyprichromis and pick them off from inside the shoal. N. pleuromaculatus is a more conventional ambush-and-pursuit hunter, but it occupies the same predatory guild in the shallow littoral, where small-fish prey is abundant.

Behavior & breeding

Like other lamprologines, this is a substrate spawner rather than a mouthbrooder. It breeds among rocks, with smaller individuals also using empty snail shells as shelter. Males are often polygynous, holding and defending a small cluster of stones as a territory. The eggs — typically on the order of fifty — are laid more or less in the open on a rock surface (or occasionally inside a shell) rather than deep in a hidden cave; after the eggs hatch, the larvae may be shifted into a shallow pit excavated in the sand, where the female tends them. In aquarium accounts the fish is also reported to breed in caves, a flexibility typical of the group.

Temperament matches the trophic role. It is a predator and behaves like one: aggressive toward tankmates, and a steady threat to any fish or fry small enough to swallow. Keepers of the larger Lepidiolamprologus consistently describe the genus as combative and territorial — one Australian cichlid forum's long-running thread on "larger Tanganyikan predators" repeatedly flags how relentless these fish become around their stones — and pleuromaculatus, while smaller, carries the same disposition in proportion.

In the aquarium

This is a fish for a Tanganyika keeper who wants an honest predator rather than a centerpiece. It has been exported, mainly out of Bujumbura, for decades, yet never became popular — it lacks the dramatic bulk of the big Lepidiolamprologus and the novelty of the dwarf shell-dwellers, so it tends to reach the hobby only as occasional wild-caught imports (sometimes a trio at a time, as scattered forum sale reports show).

A bonded pair can be kept in roughly 120 L (about 30 US gal), but a community setup wants at least 300 L (about 80 US gal) to absorb the aggression. Replicate the biotope: fine sand, plenty of rock arranged into defensible small territories, and the hard, alkaline, stable water (pH ~8, high carbonate hardness, mid-70s F) that all Tanganyikans require. Tankmates should be other robust Tanganyikan carnivores of similar size and attitude; do not house it with much smaller fish or fry, which it will treat as food, and avoid keeping it alongside its own genus or close look-alikes such as L. attenuatus — both for the risk of hybridization and for dominance fights. The most common mistakes are underestimating its appetite for small tankmates and over-trusting care-sheet claims that it is "easy": it is hardy and undemanding on water, but it is a territorial predator, not a peaceful community fish.

Conservation

On the IUCN Red List, Neolamprologus pleuromaculatus (assessed under Lepidiolamprologus pleuromaculatus) is listed as Least Concern. The assessment was carried out in 2006 by Bigirimana and Nzeyimana and remains current in the most recent Red List version (2025-2). There is no commercial fishery targeting it, and its collection for the aquarium trade is small and intermittent — so on its own status, the species is not considered threatened. That should be stated plainly: this is a Least Concern fish, not an endangered one.

The caution is that the lake around it is under real strain. Lake Tanganyika has been warming for decades; O'Reilly and colleagues (2003, Nature) linked that warming to stronger stratification, weaker vertical mixing, and roughly a 20% drop in primary productivity, with corresponding declines in fish yields. Cohen and colleagues (2016, PNAS) used sediment records to show that warming has accompanied declines in commercially important fish and the loss of a large fraction of the lake's oxygenated bottom habitat. Closer to this fish's world, sediment pollution from catchment deforestation degrades exactly the rocky and intermediate littoral it depends on (Cohen and colleagues documented this nearshore impact in the early 1990s). Because pleuromaculatus is a shallow, narrow-range shoreline species rather than a deep or pelagic one, the threat that bears most directly on it is not the warming of the depths but the smothering of nearshore rock by sediment near the populated northern basin. Tanganyika's fate is shared across Burundi, the Democratic Republic of the Congo, Tanzania and Zambia, and is coordinated through the four-nation Lake Tanganyika Authority — a reminder that protecting even a "Least Concern" littoral endemic ultimately depends on the health of the whole basin.

Neolamprologus pleuromaculatus

About this species