Flagtail Catfish

Adult specimens of this fish reach a length of about 8 cm. Its appearance differs slightly from typical catfishes, which are usually characterized by a somewhat flattened body and a massive head with a wide mouth. The morphological features of the Flagtail Catfish are explained by its lifestyle: it spends significant time swimming rather than on the bottom, which has left its mark. Therefore, its body is robust, fins are well-developed, and the head has a pointed shape. One of the most recognizable features of the species is its tail, adorned with a striped pattern of alternating black and white horizontal bands. The body coloration of the fish is gray with dark speckles.

The species inhabits South America, predominantly in the Amazon River basin and its tributary, the Rio Negro. In nature, it occupies slow-flowing tributaries and streams with shaded areas, where the bottom is covered with soft sand or silt. The biotope is characterized by dense riparian and floating vegetation, creating diffused lighting.

This fish is distinguished by its mobility and friendly disposition. It prefers to be in a group, optimally 3–4 individuals. Towards other aquarium inhabitants, the Flagtail Catfish is peaceful. It can certainly be kept together with many non-aggressive and non-territorial fish species. For example, good compatibility is observed with related Corydoras, but it should be noted that they do not get along well with some cichlids, such as Geophagus.

For these swimming fish, the optimal aquarium volume starts from 100 L, which corresponds to a side length of 80 cm. When setting up the tank, it is important to provide both open areas for swimming and secluded spots for hiding. Dense plant thickets, snags, pieces of bark, coconut shells, and large leaves of some trees are suitable for this purpose. Dim lighting is recommended; this can be achieved with floating plants that will create natural shading. Successful and long-term keeping of these fish depends on maintaining stable water parameters within the permissible values of key hydrochemical indicators (pH and dGH). Regular aquarium maintenance, including partial water changes and removal of organic debris, will help prevent the accumulation of harmful waste products.

Usually, acclimatized individuals, as well as those bred and raised in aquarium conditions, easily adapt to offered dry food. Nevertheless, for their health, it will be very beneficial to supplement their diet with live or frozen foods, such as brine shrimp, daphnia, or bloodworms.

Spawning is paired and stimulated by imitating the rainy season through frequent water changes and a temperature drop of 2–4 °C. The male builds a bubble nest under broad plant leaves or artificial substrates. After laying up to 500 eggs, the male guards the clutch. The incubation period lasts up to 5 days. Fry are extremely sensitive to water quality and the presence of protein contamination in the first days of life.

Fish are susceptible to diseases typical for armored catfishes when keeping conditions are violated. High sensitivity to water quality and organic accumulation can lead to fin and skin damage by bacterial infections or mold fungi. Prevention requires regular filtration, aeration, and weekly water changes, as well as the use of soft substrate to prevent damage to their delicate barbels.

When purchasing, one should choose active individuals with clean scales and undamaged fins. It is important to check the integrity of the barbels, as their absence indicates improper keeping conditions in the store. A healthy fish should show interest in food and have no signs of emaciation or whitish film on its body. It is recommended to acquire a group of 3–5 individuals to ensure natural social behavior.