Synodontis granulosus Breeding Guide

The Lake Tanganyika endemic Synodontis granulosus has no documented aquarium reproduction; only wild spawning-season observations exist.

Overview

Synodontis granulosus is endemic to Lake Tanganyika, recorded from the Democratic Republic of the Congo, Burundi, Zambia and Tanzania. It occupies littoral to benthic zones over shell, sand and mud, most commonly between 20 and 40 m depth and down to about 130 m. Maximum standard length reaches 21.6 cm (about 27 cm total length). As an omnivore it feeds on insect larvae, algae, gastropods, bivalves, sponges, crustaceans and the eggs of other fishes.

Sexing

No reliable external sexing method is described in the available sources. Females are reported to be slightly larger than males of similar age, but this is not a dependable diagnostic.

Spawning Behavior & Trigger

At the genus level, spawning is reported during the flooding season between roughly July and October, with pairs swimming in unison. These observations are general and have not been tied to specific recorded spawns of Synodontis granulosus.

Egg & Fry Care

No account of egg or fry development is available for this species. Because reproductive knowledge for the genus is largely confined to egg counts from gravid females, no fry-rearing procedure can be given from the sources.

Common Challenges

The lack of an established spawning method is the chief barrier. Synodontis granulosus becomes semi-aggressive at maturity, complicating long-term pairing. It belongs to the Lake Tanganyika radiation that also contains the brood-parasitic cuckoo catfish (Synodontis multipunctatus); that parasitic strategy, in which catfish eggs are slipped into the clutch of mouthbrooding cichlids, is documented for S. multipunctatus and not for S. granulosus.