More info
Datasheet
| Minimum Tank Size | 540 litres / 142.65 US gallons |
| Maximum Size | 25.0cm / 9.84inches |
| Temperature | 22°C / 71.60°F - 28°C / 82.40°F |
| Hardness | 1.01dgH / 18ppm - 8.01dgH / 143ppm |
| pH | 5.0-7.0 |
General Description
The Gulper Catfish, also known as the "ogre catfish," is a predatory species belonging to the Auchenipteridae family. It is classified under the Siluriformes order and can reach a maximum size of 25.0cm. This species, scientifically named Asterophysus Batrachus, is characterized by its ability to consume fishes nearly twice its size, making it unsuitable for community aquariums.
Aquarium Setup
The Gulper Catfish requires a minimum tank size of 540 litres. Ideally, a soft, sandy substrate is recommended, along with dim lighting, driftwood, and scattered tree roots/branches to provide potential refuges. Efficient filtration is crucial due to the high waste production of predatory species. It is advised to use external canister filters or a sump system to maintain water quality. Weekly water changes of 30-50% are necessary to prevent the build-up of organic pollutants.
Behaviour
This species is a skilled predator that feeds on white fish, whole shrimp, and earthworms once they are recognized as food. Adult Gulper Catfish do not need daily feeding, with 1-2 meals per week being sufficient. They should not be fed mammalian/avian meat or live feeder fish, which may introduce parasites or diseases.
Feeding and Diet
The Gulper Catfish is an obligate predator by nature but readily accepts a varied diet in captivity. Their diet consists of strips of white fish, whole shrimp, and earthworms. Feeding adult individuals 1-2 meals per week is recommended to maintain their nutritional needs.
Reproduction & Dimorphism
Reproduction behavior of the Gulper Catfish remains unreported. In sexually-active males, the anal-fin rays thicken, elongate, and fuse together to form a structural support for the intromittent organ, leading to the displacement of the genital pore to the tip of the modified rays.
Habitat and Distribution
Inhabiting blackwater tributaries, the Gulper Catfish is commonly found in the Rio Negro system in Brazil and the Orinoco drainage in Venezuela. They prefer shallow waters and are most active during the night, exhibiting hunting behavior in their natural habitat.