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Lake Tanganyika cichlids — species, locations & maps

Lake Tanganyika cichlids — species, locations & maps
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Neolamprologus sp. 'gracilis tanzania' Lubugwe Bay.jpg Neolamprologus sp. 'gracilis tanzania' Lumbye Bay.jpg Neolamprologus sp. 'gracilis tanzania' Lyamembe.jpg Neolamprologus sp. 'gracilis tanzania' Siyeswe Bay.jpg
Previous pageNext pageNeolamprologus sp. 'gracilis tanzania' Lumbye Bay
Tribe / Genus: Lamprologini / Neolamprologus
Biotope: Neolamprologus sp. 'gracilis tanzania' lives in dense groups in deeper rocky and intermediate habitats, most commonly at depths between 5 and 30 m, and is only rarely encountered in very shallow water. The majority of the population occupies predominantly rocky zones between 7 and 15 m depth.
Geographic distribution: Central eastern shore of Lake Tanganyika along the Mahale coast. Occurs north of Sibwesa and probably extends northwards to the Lubulungu River area. Found sympatrically with N. sp. 'princess lyamembe' and N. savoryi.
Typical adult size: Approximately 7–8 cm total length excluding the caudal-fin extensions; including the filamentous tail extensions, individuals may exceed 10 cm.
Sexual dimorphism: No obvious sexual dimorphism. Males are on average slightly larger and less rounded in the abdominal region.
Recommended aquarium size: At least 150 liters for a species-only colony. In community aquaria, a minimum of 300 liters is recommended due to colony expansion and territorial behaviour.
Aquarium setup: A rock-dominated setup with extensive piles of stones forming numerous caves and passages. Rocks should preferably extend high toward the back of the aquarium. Fine sand may be present but is of secondary importance.
Diet: Carnivorous. Feeds mainly on small invertebrates such as insect larvae and copepods, taken from the biocover and the water column.
Breeding: A cooperative breeder forming large colonies. Each breeding pair occupies a small rocky cave and guards its offspring with the help of numerous “helpers”, typically juveniles from previous broods. Clutches usually consist of 20–50 eggs. Fry feed on plankton once free-swimming.
Aggression: Moderately aggressive within the species, but generally less aggressive than N. brichardi and N. pulcher. Territorial aggression increases during breeding.
Special notes: Neolamprologus sp. 'gracilis tanzania' belongs to the N. savoryi species complex and is extremely similar to N. gracilis from the Congolese shore. Morphologically, it cannot be reliably distinguished from N. gracilis, although it differs clearly from other Princess species such as N. marunguensis, N. crassus, and N. falcicula by a combination of body shape, fin morphology, and coloration.
Molecular data (Ronco et al., 2020) indicate that N. sp. 'gracilis tanzania' is the sister taxon to N. gracilis, and the two may represent eastern and western populations of the same species. Both share a preference for deeper rocky habitats and display exceptionally long filamentous extensions of the caudal fin, among the longest of all Princess cichlids.
The species is highly social and forms dense, long-lasting colonies that may occupy the same section of habitat for decades. Group living appears to be driven primarily by predator avoidance rather than by limited breeding sites.

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