Redtail Catfish

The distribution of this fish covers the river basins of the Amazon and Orinoco, where it prefers to inhabit deep backwaters. The upper part of the catfish's body is dark gray with small dark spots, while the belly remains white. A reddish tint is also observed on the tips of the dorsal and pelvic fins, and its tail has a rich red color. This catfish reaches impressive sizes; adult specimens can grow up to 130 cm in length.

The Redtail Catfish is endemic to South America, inhabiting the basins of the Amazon, Orinoco, and Essequibo rivers. It is found in various biotopes, including large rivers, channels, lagoons, backwaters, and areas of flooded forests. It is a bottom-dwelling fish that prefers slow currents and murky waters with an abundance of snags and submerged vegetation. In nature, this species demonstrates high adaptability to changes in environmental conditions characteristic of the seasonal flooding cycles of tropical forests.

This catfish coexists well with fish of similar size; however, aquarium species of such dimensions are extremely rare. Any fish significantly smaller than it will be considered potential food.

Keeping this species in an aquarium is fraught with great difficulties due to its size and need for significant swimming space, so the minimum aquarium volume should be no less than 10368 liters. The Flat-headed Catfish prefers the bottom layers of water and subdued lighting. An important condition is the presence of shelters, where the fish spends most of its time, especially in adulthood. The catfish will actively defend its refuge from any encroachment by other aquarium inhabitants.

Although the Redtail Catfish is an omnivorous species, its dietary preferences lean towards meaty products, particularly live food such as other fish. Young individuals eagerly consume various dry commercial foods and live food, including worms and insect larvae. As they mature, their diet changes, and the catfish begins to actively hunt small fish. Feeding intervals also increase with age: young fish require daily feeding, while adults eat once or twice a week, which is associated with their carnivorous diet and sedentary lifestyle. They must not be fed mammalian or avian meat: the lipids it contains cannot be properly metabolised by the fish and lead to excess fat deposits and even organ degeneration.

Under amateur aquarium conditions, breeding this species is practically impossible due to the colossal size of the breeders and the need for enormous volumes of water. In nature, sexual maturity occurs when they reach a length of about 75-80 cm. Spawning is timed to the beginning of the rainy season and rising water levels. For commercial purposes in tropical regions, breeding is carried out in large earthen ponds with the use of hormonal stimulation to synchronize the process.

The fish has strong immunity but is extremely sensitive to water quality and keeping conditions. The main causes of diseases are poor filtration, accumulation of organic waste, and overfeeding, leading to obesity and degeneration of internal organs. Typical problems for large catfish include bacterial infections of the skin, fins, and external parasite infestations due to stress or weakened immunity. The use of live foods of questionable origin increases the risk of introducing infections.

When choosing, attention should be paid to the fish's overall activity, clean skin, and the absence of damage to its barbels. It is important to consider that fry are often sold that grow very quickly and require huge aquariums or specialized pools. It is recommended to clarify the keeping conditions at the store and check the individual's appetite. Avoid purchasing fish with signs of emaciation, sunken bellies, or unnatural behavior, as this often indicates adaptation problems or internal diseases.