Cuckoo catfish
A brood-parasitic catfish from Lake Tanganyika
The cuckoo catfish is a small African species known for laying its eggs in the mouths of cichlids. It grows to 27.5 cm and lives in deep waters of Lake Tanganyika. This unique reproductive strategy makes it notable among freshwater fishes.
- Only known brood parasitic fish species
- Grows up to 27.5 cm in the wild
- Lives in schools at 40 metres depth
- Young eat host cichlid eggs in mouth
- Popular in cichlid aquarium setups
What it is
This small catfish belongs to the Synodontis genus, often called upside-down catfish. It reaches a maximum length of 27.5 centimetres. The body is adapted for life in deep water, where it forms large schools. Its appearance is typical of the group, with a generalist build suited for varied diets. It is distinct from its close relative S. granulosus, which eats other fish. The common name comes from its unusual breeding method, resembling that of cuckoo birds.
Where it lives
The species is native to Lake Tanganyika, part of the Great Rift Valley system in Africa. It inhabits deeper zones of the lake, typically gathering at depths around 40 metres. These waters provide the environment for its schooling behaviour. While it stays within this single lake system in the wild, its range is defined by the specific ecological conditions found there. It shares this habitat with many cichlid species, which are crucial to its life cycle.
How it lives
It lives in large groups and feeds on a wide variety of items. As a generalist, it does not rely on one food source. However, it has a specific interest in fish eggs. It is closely related to piscivorous species but maintains a broader diet. In captivity, it can be active during both day and night. Territorial aggression may occur towards other members of its genus, so keeping them in groups reduces conflict. Cover and caves help manage their lively nature.
Breeding and life cycle
This fish is the only known brood parasite among fishes. It targets mouthbrooding cichlids, such as Ctenochromis horei. When cichlids spawn, the smell excites the catfish. They release their own eggs among the cichlid eggs before the host collects them all. The cichlid then carries both sets in its mouth. Catfish eggs hatch quickly and the young use developed teeth to eat the cichlid embryos. This frees the catfish from parental care duties.
Fish and people
It is a minor part of local commercial fisheries in its native range. In the aquarium trade, it is popular for cichlid tanks. Breeders can raise them in captivity if suitable host cichlids are present. Hosts from Lake Malawi and Lake Victoria have also been used successfully. Aquarists note they are lively and need space. Keeping more than three together helps reduce territorial disputes. Proper tank structures with caves are recommended for their well-being.
Questions people ask about Cuckoo catfish
How does the cuckoo catfish reproduce?
It lays eggs among those of mouthbrooding cichlids. The host fish collects all eggs into its mouth. Catfish eggs hatch first and the young eat the cichlid embryos inside the host's mouth.
What size do they reach in an aquarium?
In captivity, they typically grow to about 15 centimetres. This is smaller than their maximum wild size of 27.5 centimetres. Adequate space and group housing help manage their growth and behaviour.
Are they aggressive towards other fish?
They can be territorial towards other Synodontis species. Keeping them in groups of three or more reduces competition. They are generally lively and active during both day and night hours.
Good reading and sources
- Synodontis multipunctatus on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Synodontis multipunctatus", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
Like Cuckoo catfish
All catfishes
Sub-Saharan AfricaSynodontis
A large African genus of spotted catfish known for squeaking sounds and belly-up swimming.Catfish · Rivers and lakes
🇹🇭 Thailand and 1 moreAsian redtail catfish
Large Asian bagrid catfish with a bright red tail.Catfish · Rivers and lakes
🇧🇷 Brazil and 4 moreRedtail catfish
A large South American catfish known for its red tail and popularity in the aquarium trade.Catfish · Rivers and lakes
🇧🇴 Bolivia and 4 moreRipsaw catfish
Large thorny catfish native to South American rivers.Catfish · Rivers and lakes