Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

The Cuckoo Catfish has a bold, highly active, and sometimes pugnacious temperament. They are extremely social with their own kind but establish a distinct pecking order through harmless chasing. Their frantic energy can be stressful to shy or delicate fish, which is why robust cichlid tankmates are preferred. They are fascinating to watch due to their constant movement and interactions.

Diet

Omnivore

A ravenous omnivore, the Cuckoo Catfish will eagerly accept a wide variety of meaty and vegetative foods. Their diet should consist of high-quality sinking pellets, freeze-dried krill, and frozen bloodworms or mysis shrimp. They are aggressive eaters that will vigorously compete for food during feeding time. Snails and small invertebrates may also be predated upon in the aquarium.

Sex ratio

Group

When keeping a group, a relatively balanced mix of males and females is acceptable, though exact ratios are not critical. They are highly social and thrive best in groups of four to six or more. In smaller numbers, a dominant individual may incessantly bully the others. Determining sex is challenging, usually requiring examination of the genital papilla by an expert.

Feeding frequency

Twice daily

They should be fed once or twice daily with portions they can consume within a few minutes. Their highly active nature means they have a fast metabolism and are almost always looking for food. Because they are bold, they easily learn to come to the surface or specific feeding spots. Care must be taken to ensure they don't outcompete more timid tankmates.

Bioload

This active and moderately sized catfish contributes a medium to high bioload to the aquarium. They consume large amounts of food and produce corresponding waste, necessitating strong and efficient filtration. Over-filtration is highly recommended, especially since they are typically kept with messy African cichlids. Consistent weekly water changes are crucial to prevent nitrate buildup.

Flow

Stagnant

Coming from Lake Tanganyika, they require well-oxygenated water with moderate to strong flow. Substantial water movement across the rockwork simulates their natural environment and keeps them active. Powerheads are often utilized in their setups to maintain excellent circulation and oxygen exchange. They will often swim directly into the current for exercise and stimulation.

Reproduction

Oviparous

This species is famous for its unique brood-parasitism reproductive strategy. They meticulously synchronize their spawning with mouthbrooding cichlids, sneaking their eggs into the cichlid's clutch. The host cichlid unwittingly picks up and incubates the catfish eggs alongside its own. The catfish fry hatch earlier and quickly devour the host cichlid's eggs before being released as juveniles.

Compatibility & tankmates

They are best kept with robust Rift Lake cichlids, particularly mouthbrooding species from Lake Tanganyika or Malawi. They can be quite boisterous and may terrorize smaller, timid bottom-dwelling fish. While generally peaceful towards mid-water swimmers, they are known to nip the fins of slower moving species. They should never be trusted with fish small enough to swallow.

Tank level

Bottom

They primarily inhabit the lower and middle levels of the aquarium. Unlike many other Synodontis, they are quite active mid-water swimmers and spend significant time out in the open. They still require a network of rocky caves and crevices to retreat to when they want to rest. They are often seen boldly cruising the tank boundaries during daylight hours.