Red-tailed Hemibagrus

Adults of this species can reach about a meter in length, and their weight sometimes reaches 70–80 kg. The largest recorded specimen was 1.3 meters long. The coloration is usually dark or gray. The fins often have reddish edges, and the caudal fin is entirely red. Young catfish are characterized by a dark gray coloration. Sexual dimorphism is weakly expressed, so males and females are practically indistinguishable externally.

The natural habitat of this species covers Southeast Asia. Although some descriptions mention Cambodia as the primary place of origin, this catfish is widespread in the basins of large rivers such as the Mekong and Chao Phraya (Menam Chao Phraya). Consequently, it can be found in the territories of southern China, Laos, Vietnam, Cambodia, and Thailand. These fish prefer the main river channels, including areas with strong currents. During the wet season, they may move to flooded coastal areas of tropical forests.

This fish has an aggressive and territorial nature, which makes it incompatible with most other species. Any fish that can fit into its mouth will likely become food for the predator.

Due to its impressive size, the Asian Red-tailed Catfish requires very large aquariums with a volume exceeding 1000 liters. The design of such a tank should mimic the features of a riverbed, i.e., include sandy substrate, piles of stones and boulders, and many snags. Such a large fish produces a significant amount of waste. In addition, food remnants can also be a source of pollution. To maintain a stable balance in the aquarium ecosystem, it is necessary to regularly replace part of the water with fresh water and use high-performance filtration systems. As a rule, all necessary equipment along with communications takes up no less space than the tank itself. The installation and subsequent maintenance of such aquariums require significant financial costs and extensive experience, which is beyond the capabilities of most hobbyists.

In its natural environment, the Asian Red-tailed Catfish is a predator, and its diet mainly consists of other fish and crustaceans. In aquarium conditions, feeding should correspond to these natural characteristics. Young catfish can eat large earthworms. Feeding is usually done 1–2 times a week. It is important to avoid using animal products such as chicken or beef, as they are poorly digested and can lead to excessive fat deposition and even degeneration of digestive organs in the long term.

At the time of writing, there have been no recorded cases of successful breeding of the Asian Red-tailed Catfish in aquarium conditions. On an industrial scale, reproduction is carried out using hormonal injections. In such conditions, the incubation period is 30–38 hours. The hatched fry are only 5 mm long and feed on the yolk sac reserves for the first three days. After approximately one month, young catfish reach a size of 4 cm or more.

When kept in favorable conditions, fish rarely experience health deterioration. The occurrence of diseases usually indicates problems in keeping, such as polluted water, poor quality food, or injuries. In most cases, eliminating the root cause leads to recovery. However, sometimes medication may be required. Detailed information on symptoms and treatment methods can be found in the section "Diseases of aquarium fish."

When choosing a Red-tailed Hemibagrus, it should be noted that this is an extremely large and aggressive predator requiring specialized keeping conditions. In the store, it is important to assess the physical condition of the specimen: the body should be clean, without visible ulcers, damage, white plaque, or spots on the skin. A healthy fish is active, swims smoothly, and reacts to external stimuli. Avoid specimens that appear emaciated, have a sunken belly, or constantly stay near the water surface, unless this is caused by stress from transportation.

Before purchasing, you must ensure that you have a sufficiently large aquarium, as even young specimens grow quickly. Ask the seller about the fish's current diet and its behavior during feeding — a healthy catfish should show interest in food. Given the territorial nature of the species, only one specimen should be acquired, unless the aquarium is a public or extremely large tank. Check for all fins and the integrity of the barbels, as their damage may indicate poor water quality or aggressive tank mates in the store.