Mud Shell-dweller (L. signatus)
Lamprologus signatus
Fascinating mud-dwelling shell-dweller (4 cm). Slender and elongated, highly sexually dimorphic: the male shows off 12 vertical brown stripes, while the female is plain with a bright metallic golden belly. Tube digger in the mud in nature, adapts to shells in the aquarium.
Water Temperature
24 - 28 °C
pH Value
8 - 9
Water type
Freshwater
Tank level
Bottom
Adult size
5.5 cm
Minimum tank volume
>= 100 L
Minimum group
>= 1
GH
10 - 25 dGH
KH
5 - 12 dKH
TDS
200 - 495 ppm
Conductivity
313 - 773 uS/cm
Species description
Geographical Origin and Habitat: Lake Tanganyika (Southern Zambia). Unlike the coastal multifasciatus, this species inhabits very deep and dark muddy bottoms.
Taxonomy and Morphology: Mud-dwelling Shell Cichlid (Lamprologus signatus). Bullet-shaped profile (long and slender body) to slip horizontally into the mud. Closely related to the laparogramma.
Social Behavior: Is divided between compulsive excavation (creates huge valleys and U-shaped tubular tunnels in the sand) and the protection of the shell-cave hidden on the bottom. More peaceful than the fierce ocellatus.
Coloration and Sexual Dimorphism: Silver-striped males (about 12-14 weak gray-brown vertical bands). Monochromatic females, lacking visible bands, but during the breeding season they display an exceptionally bright iridescent purple/bronze belly. Noticeably larger males.
Care, breeding and tankmates
Aquarium Setup: 60 cm (24 inches) aquarium. Omit superfluous furnishings; focus on at least 8-10 cm (3-4 inches) of very fine sand. Although in nature they use mud tunnels to breed, in the aquarium (sand being fragile) snail shells ("escargot") are the only guarantee of a stable nest.
Diet and Feeding: Carnivore/Micro-predator. Likes tiny benthic crustaceans. To be fed copiously (2-3 times a day) with micro-pellets, decapsulated brine shrimp and frozen cyclops. In the tank, it rarely rises more than 5 cm (2 inches) from the bottom to feed.
Water Quality: Sensitive to temperature drops and debris accumulation, which in its typical tank tend to settle on the bottom. Light siphoning and alkaline chemistry (Tanganyika) are fundamental.
Compatibility and Cohabitation: Ideal in a monospecific aquarium. Possible to pair them with small fish that occupy the upper levels (Cyprichromis leptosoma). Mixing them with other bottom dwellers (e.g. Neolamprologus brichardi) means condemning the L. signatus to certain death.
Aquarium Breeding: Male and female form pairs. Spawning takes place in secret (in the buried shell or in the sand tunnel). They are not good "collective" parents: as soon as a brood becomes independent, they will be driven away or devoured in view of a new spawning.
Risks and Diseases: Deadly landslides. If the sand bed contains gravel or is not "binding" enough, the deep tunnels of the signatus will collapse on it, fatally trapping it.
Geographic Origin and Distribution
Lake Tanganyika (Southern Zambia). Unlike the coastal multifasciatus, this species inhabits very deep and dark muddy bottoms.
Origin
Selective breeding and cultivarsAfrica and MadagascarEast AsiaTropical oceans and reefs
Fish profile
- Temperament
- Semi-aggressive
- They are territorial and will vigorously defend their burrow or shell from intruders. However, their aggression is largely confined to their immediate property line rather than an expansive territory. Toward non-competing, mid-water fish, they are generally peaceful and indifferent.
- Diet
- Omnivore
- They are strict carnivores that forage for small crustaceans and insect larvae in the wild. A high-quality diet of frozen cyclops, daphnia, and baby brine shrimp is essential for their health. Sinking cichlid micro-pellets can be offered, but live or frozen foods should be the primary staple.
- Life expectancy
- 5-8 years
- The average lifespan of this small cichlid in an optimal aquatic environment typically ranges between 5 and 8 years. Careful management of water changes and the absence of pollutants are essential to promote longevity. The biological stability of the filter plays a decisive role in avoiding osmotic fluctuations harmful to the fish's health.
- Adult size
- 5.5 cm
- The catalog's scalar value is 5.5 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 5.5 cm for this species, recorded as total length (TL). The taxonomic record consulted is Lamprologus signatus (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Harem
- They exhibit distinct sexual dimorphism and naturally form pairs rather than harems. Keeping a single male-female pair is highly recommended to observe their fascinating cooperative behaviors. Keeping multiple males will result in severe territorial clashes unless the aquarium has an unusually large footprint.
- Feeding frequency
- Twice daily
- Due to their high activity levels and fast metabolism, they should be fed two to three times daily. Very small portions of appropriately sized food ensure they get enough calories without fouling the water. Ensure the food sinks quickly to their level so they don't have to venture too high.
- Bioload
- This highly elongated shell dweller produces a minimal bioload due to its slender profile and small mass. They are highly sensitive to poor water quality, making excellent biological filtration mandatory despite their low waste output. Strict adherence to a weekly water change schedule is necessary for their long-term survival.
- Flow
- Stagnant
- They originate from deep, muddy bottoms where the water flow is extremely gentle. Strong currents will severely stress them and prevent them from maintaining their burrows or shells. A simple sponge filter provides the perfect combination of gentle flow and efficient biological filtration.
- Reproduction
- Oviparous
- They are unique because they will spawn in empty shells or dig deep, intricate tunnels in the mud or sand. The female cares for the eggs deep within the burrow while the male aggressively guards the entrance. Providing both escargot shells and a very deep sand bed gives them the option to choose their preferred method.
- Compatibility & tankmates
- They are moderately aggressive but more tolerant than other shell dwellers due to their mud-dwelling nature. They should not be kept with larger cichlids that could view their slender bodies as prey. Peaceful mid-water swimmers make the best companions in a community Tanganyikan tank.
- Tank level
- Bottom
- They are strictly confined to the bottom of the aquarium, rarely swimming above the substrate. Their slender, torpedo-like bodies are perfectly adapted for diving into sand and navigating tight tunnels. The mid and upper levels of the tank will be completely ignored by this species.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.6 ± 0.59 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01445, b = 2.99
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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