Taxonomy & naming
Described by George Albert Boulenger in 1900. The type locality is the northern end of Lake Tanganyika. It is a valid Synodontis in the Catalog of Fishes and belongs to the group of Tanganyikan species rather than the West African or Congo river forms.
Morphology
A Synodontis build with a locking serrated dorsal and pectoral spine, three barbel pairs and a scaleless body. The epithet refers to a granulated texture. FishBase gives a maximum of 10.5 in TL.
Habitat
A Lake Tanganyika endemic, recorded from Burundi, the Democratic Republic of the Congo, Tanzania and Zambia. FishBase classes it as a freshwater benthopelagic fish and lists 72–79 °F. Like other Lake Tanganyika fish it lives in hard, alkaline water. Tanganyika is a hard, alkaline, well-buffered rift lake, so this Synodontis differs from the soft-water river species of West Africa.
Feeding
Omnivorous benthic forager like its relatives; in the aquarium it takes sinking pellets, wafers and frozen foods, best offered after lights-out.
Mating
FishBase notes distinct pairing during breeding. Sexual differences in squeakers are usually subtle, with females fuller-bodied when ripe.
Breeding
The species is oviparous, with distinct pairing at spawning according to FishBase. It is not recorded as bred in the aquarium. Do not assume it shares the brood-parasitic behaviour of S. multipunctatus, which is documented for that species only.
In the aquarium
Keep it in Tanganyikan-type water: hard, alkaline, pH 8 to 9, at 72–79 °F. It needs a large tank with rock caves, and it is scaleless and sensitive to copper. Handle with care because of the locking spines.
Conservation
The IUCN Red List assessed Synodontis granulosus as Least Concern in 2025. Wild-caught fish are the usual source in trade.