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

Taxonomy & naming

Ethelwynn Trewavas and Max Poll described this species in 1952 as Lamprologus sexfasciatus, working from fish collected at the M'Toto rocky islets in the southern part of Lake Tanganyika, at a depth of just two to three metres. The species epithet is simply descriptive: sexfasciatus means "six-banded" in Latin, for the six dark bars that cross the flanks. That count is not incidental trivia, it is the cleanest way to tell the fish from its close look-alike N. tretocephalus, which carries five.

Like most of the lake's small predatory cichlids, it began life in the catch-all genus Lamprologus. The genus Neolamprologus was erected by Colombé and Allgayer in 1985 during a broad reshuffling of that old assemblage, and Maréchal and Poll's 1991 checklist of African freshwater fishes placed sexfasciatus in it, where Eschmeyer's Catalog of Fishes and FishBase both keep it today as the valid name Neolamprologus sexfasciatus (Trewavas & Poll, 1952). It sits in the tribe Lamprologini, the substrate-brooding lineage that, with on the order of a hundred described species, accounts for much of Tanganyika's cichlid diversity. In the trade it is sold as the six-bar or "gold sexfasciatus," the latter after its most common color form.

Appearance

This is a robustly built, deep-bodied Neolamprologus with the genus's typical blunt-headed predator's profile. The ground color depends entirely on where in the lake the population comes from, but the six black vertical bars are constant across every form. The most familiar aquarium variant is a yellow-to-gold fish, while populations in the far south, roughly between Moliro in the Democratic Republic of the Congo and Kala in Tanzania, are blue. Other geographic morphs blend the two, with yellow heads and upper bodies grading into paler flanks. Forms circulate under locality names such as Kipili, Kala, and "Sambia."

Reports of maximum size cluster tightly: FishBase lists 15 cm (about 6 in) total length, Seriously Fish gives the same figure as a maximum standard length, and lake-habitat references put wild adults near 16 cm (6.3 in), with aquarium fish occasionally a touch larger. Sexual dimorphism is subtle, which makes the species genuinely hard to sex by eye, but males grow noticeably larger than females and that size gap is the most reliable cue. The single most useful identification point remains the bar count against N. tretocephalus: six bars here, five there. The two are so similar in shape and barring that the gold coloration of typical sexfasciatus is often the quickest tell in a dealer's tank.

Range & habitat

Neolamprologus sexfasciatus is endemic to Lake Tanganyika and, unlike many of its lake-wide relatives, confined to the southern half. Sources draw the boundaries slightly differently: Seriously Fish brackets it between Cape Tembwe and Karema, while more detailed habitat surveys place it south of Cape Tembwe on the western Congolese shore and south of Isonga on the eastern Tanzanian shore. Along parts of that eastern coast its range overlaps with the five-barred N. tretocephalus, yet the two are not reported to interbreed, a clean case of two near-identical cichlids holding their species boundary where they meet.

It lives in shallow water, in rocky zones and the "intermediate" habitat where scattered boulders sit on sand. Compared with N. tretocephalus, it tends to favor stretches with more rock and less open sand. The type series came from only two to three metres down, and the fish is generally an animal of the well-lit upper rocky shore rather than the deep reef. As with everything in Tanganyika, the water it lives in is hard, highly mineralized, and strongly alkaline, with a pH around 8 to 9 and surface temperatures in the mid-70s to low-80s Fahrenheit (about 24-27 C). Any care reference quoting a near-neutral pH for this fish should be treated as an error against the lake's real chemistry.

Ecology & diet

Exactly what this fish eats in the wild is the one place its sources genuinely disagree, and it is worth being honest about. FishBase, drawing on examined intestinal contents, simply calls it carnivorous and places it at a trophic level around 3.7. Hobby references lean harder, with Seriously Fish describing it as piscivorous and forum write-ups emphasizing a fish-eating predator. Field-oriented sources paint a broader picture: habitat references describe a carnivore taking a range of invertebrates, including insects, crustaceans, and mollusks, with small fishes only an occasional item, and note that for many Tanganyikan Neolamprologus the dominant wild food is actually planktonic crustaceans rather than fish, following the lamprologine feeding studies of Gashagaza and colleagues.

The most defensible summary is that N. sexfasciatus is a robust generalist carnivore of the rocky littoral, equipped to take invertebrates from the substrate and to seize small fish when the chance arises, rather than a dedicated piscivore. That ecological role, a mid-sized opportunistic predator working the boulders and rubble of the shallow southern shore, also explains its temperament: a fish that defends a patch of rock and treats most things its own size as either a rival or a meal.

Behavior & breeding

Socially, this is a difficult, intensely territorial fish, and almost everything keepers struggle with traces back to that. It is very aggressive toward its own kind, to the point that even a large aquarium should hold only a single pair. It is a bi-parental cave spawner: the pair takes a rock cave, often enlarging it by digging, and the female lays her eggs out of sight on the cave floor, so spawning is frequently only detected once fry appear. During spawning the dark bars fade dramatically, sometimes reduced to a row of spots along the midline.

Sources diverge on how durable the pair bond is, and the difference is real rather than careless. Seriously Fish and hobbyist accounts describe a weak, temporary bond that lasts only through spawning and brood care, after which the male often turns on the female, so much so that pairs are said to break up and the female becomes a target once the fry are independent. Lake-habitat references, by contrast, describe a more monogamous arrangement in which the pair stays together through an extended parental period of around four months, guarding a large clutch on the order of 500 eggs until the juveniles, by then around 3 cm, are driven off. Both can be true of a fish whose pair stability varies with space and population. What every source agrees on is that you cannot simply introduce an adult male and female and expect a pair, the usual outcome there is a harassed, often dead female, and that fry are large enough to take newly hatched brine shrimp essentially from the start.

In the aquarium

This is not a community fish and not a beginner's fish, and the honest framing matters more than any single parameter. The recurring advice across hobby sources is a tank of at least 48 in (120 cm) for a single pair, aquascaped with piles of rock built into caves over a sandy bottom, leaving open water between the structures. Filtration should be generous: a carnivorous diet means a heavy waste load. Keep the water like the lake, hard and alkaline at pH roughly 8 to 9, in the mid-to-upper 70s Fahrenheit (about 24-27 C).

The central mistake keepers make is trying to pair the fish on purpose. Because adults will not be forced together, the reliable route is to grow out a group of young fish, let a pair form on its own (which can take a year), and then remove every other individual, because the pair will not tolerate them. Once a pair spawns the male becomes formidable, guarding the cave with a ferocity that some keepers describe as turning on anything that approaches, including a hand in the tank. Tankmate choice is about giving wide berth: medium-sized Tanganyikans that use different parts of the tank, such as open-water Cyprichromis, are the safest, and larger Julidochromis or Altolamprologus can work in a big, well-structured tank. Seriously Fish notes it can even be kept with robust Malawi mbuna, but it is explicitly not recommended for a general peaceful Tanganyikan community. Anything small enough to be eaten eventually will be.

Conservation

Neolamprologus sexfasciatus is listed as Least Concern on the IUCN Red List, in an assessment dated 24 February 2025. Its restriction to the southern half of Lake Tanganyika makes it a narrower-range endemic than many of its lake-wide relatives, but within that range it is not considered threatened, and collection for the aquarium trade is modest and has not been flagged as a population-level concern. The honest statement is the simple one: the species itself is currently secure, even as the lake around it is under measurable strain.

That lake-level strain is well documented and bears on every Tanganyikan endemic. O'Reilly and colleagues (2003, Nature, doi:10.1038/nature01833) found that climate warming has strengthened the lake's stratification and reduced the deep mixing that brings nutrients up from below, with sediment records implying primary productivity may have fallen by roughly 20%, and fish yields by something like 30%. Cohen and colleagues (2016, PNAS, doi:10.1073/pnas.1603237113) added that warming has driven a substantial loss of oxygenated benthic habitat, on the order of 38%, squeezing the lake's bottom-associated fauna from below. Closer to this fish's own home, deforestation in the catchment loads the rocky littoral with sediment that smothers the boulders and crevices shallow rock-dwellers like N. sexfasciatus depend on (Cohen et al. 1993). Layered on top is the heavy pelagic fishery for clupeids (Stolothrissa and Limnothrissa) and their Lates predators, which feeds four nations and is coordinated, imperfectly, through the four-country Lake Tanganyika Authority. None of this targets the six-bar directly, but as a shallow rocky-shore specialist of the warming, sediment-prone southern littoral, it lives squarely in the habitat guild those basin-scale pressures act on.

Neolamprologus sexfasciatus

About this species