Ageneiosus Marmoratus

Datasheet

General Description

The Bottlenose Catfish, scientifically known as Ageneiosus Marmoratus, is a predator commonly referred to as the 'Guyana slopehead catfish,' 'dolphin catfish,' or 'hammerhead catfish.' This species belongs to the order Siluriformes and the family Auchenipteridae. It features large, irregular, sharply contrasting black blotches on its body, head, and fins. The fish has a robust head, broad, parabola-shaped snout with a wide gape, and an emarginate caudal fin. It can grow up to 18.5 cm in size and is recognized for its unique color patterns.

Aquarium Setup

For optimal care, a tank size of a minimum of 540 liters is recommended for the Bottlenose Catfish. The ideal tank setup includes a soft, sandy substrate, dim lighting, driftwood, tree roots/branches, and water-worn rocks. Ample open swimming space is essential as the species enjoys spending time in open water. Efficient filtration, such as external canister filters or a sump system, is crucial due to the species' predatory nature. Weekly water changes ranging from 30-50% are necessary to maintain water quality.

Behaviour

The Bottlenose Catfish exhibits surprisingly peaceful behavior towards tankmates too large to swallow. It is recommended to house them with placid fish species that feed from the substrate to prevent aggression. This species is not aggressive towards conspecifics and tends to display loosely gregarious behavior when in a group of four or more individuals.

Feeding and Diet

As a carnivorous species, the Bottlenose Catfish primarily feeds on invertebrates and other fishes. They have a preference for live prey initially but can be weaned onto thawed frozen whitebait, shellfish, or pellets designed for carnivorous species. Avoid feeding them mammalian or avian meat and 'feeder fish' to prevent health risks.

Reproduction & Dimorphism

The reproductive behavior of the Bottlenose Catfish is largely unrecorded in aquarium settings. Fertilization occurs internally through modified genital papillae in males, with courting behaviors involving extended maxillary barbels and dorsal fin rays. Adult males exhibit marked seasonal sexual modifications, including ossification and extension of the maxillary barbel and anal fin ray thickening. Adult females possess longer anal fin rays compared to males.

Habitat and Distribution

Native to regions like central Guyana, Suriname, Peru, Ecuador, and possibly Argentina, the Bottlenose Catfish likely inhabits lower sections of river channels and large tributaries. This species is adaptable to a variety of habitats due to its extensive natural range across South America.