Cuckoo Catfish Care Guide
Synodontis multipunctatus is a Lake Tanganyika catfish and the only known fish brood parasite, mixing its eggs with mouthbrooding cichlids.
Compiled by Aquairi from published sources · Published · Updated
Overview
The cuckoo catfish (Synodontis multipunctatus) is a Mochokidae catfish endemic to Lake Tanganyika, described by Boulenger in 1898. It has a body covered in multiple spots. It is famous as the only known fish brood parasite, exploiting mouthbrooding cichlids.
Taxonomy
- Family: Mochokidae
- Genus: Synodontis
- Scientific name: Synodontis multipunctatus
Habitat
The species is native to Lake Tanganyika in Africa's Great Rift Valley. FishBase records it over muddy bottoms down to at least 100 metres, and it forms large schools in deeper water.
Tank requirements
- Minimum tank volume: 300 L
- Temperature: 24-27 °C (record); FishBase reports 21-25 °C
- pH: 7.5-9
- GH: 10-20 °dGH (FishBase reports a wide 15-35 dH range)
- Maximum size: about 27.5 cm; around 15 cm in aquariums
- Group: keep 3 or more
- Lifespan: 10-15 years
Diet
It is a generalist feeder. FishBase notes it feeds on snails, particularly Neothauma species, as a zoobenthos feeder, and it also takes fish eggs in line with its parasitic strategy. In aquariums it accepts prepared and live foods.
Compatibility
It can be territorial and aggressive toward other Synodontis, so it is best kept in groups of three or more with caves and cover. The record lists Tanganyikan cichlids, Frontosa and other Synodontis as suitable companions; small fish and aggressive bottom dwellers are best avoided.
Breeding
The cuckoo catfish times its spawning to coincide with that of mouthbrooding cichlids, mixing its eggs into the host's clutch. The catfish larvae develop faster than the host fry and consume the cichlid eggs and embryos inside the mother's mouth, which removes parental-care burden from the catfish.
Cuckoo Catfish Breeding Guide
Overview
The cuckoo catfish (Synodontis multipunctatus) is endemic to Lake Tanganyika in the Great Rift Valley, where it gathers in large schools at depths of around 40 metres, reaching about 27.5 cm in nature and around 15 cm in aquaria. It is the only known brood parasite among fishes, and can be bred in captivity provided suitable mouthbrooding cichlid hosts are present. Seven maternal mouthbrooding cichlid species are reported as natural hosts in the lake, all sharing a reproductive behaviour the catfish exploits.
Breeding Setup
The species requires hard, alkaline Tanganyikan conditions (24-27 °C, pH 7.5-9, GH 10-20) and, critically, a group of mouthbrooding cichlids that spawn over open substrate. A host-to-parasite ratio of about 2:1 cichlids to catfish has been found to produce good breeding results. Natural hosts in the lake include Ctenochromis horei and Simochromis babaulti; in captivity, mouthbrooders from Lakes Malawi and Victoria are also parasitised with some success.
Spawning Behavior & Trigger
The scent of spawning cichlids excites the catfish, which is the trigger for their own spawning. As the cichlid pair releases and the female begins collecting her eggs, the catfish release and fertilise their own eggs within the cichlid egg mass. The female cichlid then gathers both her own and the parasitic eggs into her mouth.
Egg & Fry Care
The catfish eggs resemble the host's own and develop more rapidly than both other Synodontis and the cichlids. Incubated orally by the unwitting host, they hatch first inside her mouth and then eat the cichlid's eggs and embryos using their well-developed teeth and jaws. The female lays small clutches but produces eggs frequently. Once released, the catfish fry are raised on standard small foods; the cichlid host typically rears few or none of her own young.
Common Challenges
Success depends on having actively spawning host cichlids whose timing the catfish can exploit; without willing mouthbrooders, no parasitic spawning occurs. Keepers should expect to sacrifice the host cichlids' broods, since the catfish fry consume them.