Ageneiosus magoi Care Guide - Habitat, Diet & Breeding

Ageneiosus magoi is a little-known South American driftwood catfish in the family Auchenipteridae. Its elongated body, flattened head and whisker-like barbels give it the characteristic appearance of a nocturnal river catfish, while its subdued brown and grey colouring helps it blend into dim, woody habitats.

This species is primarily active after dark. During daylight hours it may remain hidden among submerged wood, roots or other cover, becoming more adventurous once the aquarium lights go out. Its sensitive barbels help it locate food and navigate in murky water.

In nature, Ageneiosus magoi is associated with the warm, seasonally variable waterways of the Orinoco basin. These environments can contain slow-moving margins, submerged vegetation, leaf litter and flooded forest debris, producing a shaded setting with plenty of natural shelter.

Like other members of its genus, it is a predatory catfish rather than a schooling community species. It is an unusual and specialised aquarium inhabitant, best suited to experienced keepers who can accommodate its eventual size and nocturnal behaviour.

Ageneiosus magoi is native to the Orinoco River basin in northern South America, particularly Venezuela. It inhabits freshwater river and floodplain environments associated with the basin.

A mature adult should be housed in at least a 300-litre aquarium measuring about 120 x 50 cm or larger, with additional length and volume preferred for large specimens. Use a secure lid, gentle to moderate filtration and well-oxygenated, stable water. Provide a soft sand or fine rounded-gravel substrate, substantial driftwood, roots, caves and shaded retreats, while leaving an open area for nighttime swimming. Dim lighting and floating plants can help recreate its naturally subdued environment. Keep the temperature around 24–28°C and the pH approximately 6.0–7.5.

Up to approximately 25 cm (9.8 in) in adult length. Females may become somewhat larger and deeper-bodied than males.

This carnivorous catfish should receive a varied diet of sinking meaty foods, including quality carnivore pellets, chopped earthworms, prawns, mussel and suitably sized frozen foods. Feed after dark or when the aquarium is dimly lit, and remove uneaten food promptly. Young fish need appropriately small portions, while adults should not be overfed.

Ageneiosus magoi can be kept with peaceful, robust fish of a similar or larger size, such as sizeable characins, peaceful cichlids and other non-aggressive South American catfish. Avoid very small fish, shrimp and delicate tankmates that may be treated as prey, as well as fin-nipping or highly territorial species. It is generally not a suitable companion for tiny community fish.

Ageneiosus magoi is rarely bred in aquariums. In the wild, species in this genus use internal fertilisation, with males possessing a modified anal fin used during mating. Successful breeding would require mature, well-conditioned fish, excellent water quality and a spacious, species-appropriate setup, but reliable captive-breeding methods for this species are not well established.

Females are generally larger and more robust than males. Mature males develop a modified anal fin associated with internal fertilisation, which is the most reliable distinguishing feature, although it can be difficult to assess in young fish.