Opsarius dogarsinghi

Adults can reach a length of approximately 8 cm. They are characterized by a gray back and a light silvery belly. A metallic sheen is noticeable on the body. The pattern consists of 8–9 dark blue vertical stripes. Two short barbels can be seen near the mouth. During the breeding season, males, unlike females, may develop small tubercles on their heads and orange pigmentation on the lower part of their bodies.

The habitats of this fish cover the extensive basin of the Chindwin River. It is found in the northeastern regions of India and the western regions of Myanmar. Typically, Opsarius dogarsinghi prefers sections of rivers located in hilly, sometimes even mountainous terrain. Its typical habitat is a full-flowing stream with a fast current, the bottom of which is strewn with stones and boulders.

Opsarius dogarsinghi are active and fast fish. They can cause discomfort to slower or smaller species, which will also lose out to them in competition for food. When choosing tank mates, it is advisable to focus on active fish of similar size. In addition, it is necessary to consider the characteristics of their natural habitat, which is characterized by strong or moderate currents, which, of course, limits the number of compatible species. Good tank mates might include, for example, some species of Barbs, Loaches, and representatives of catfish.

It is desirable that the aquarium be set up to imitate a section of a turbulent river. The substrate should be formed from stones, sand, and fine gravel, complementing the composition with several secured snags. To create the necessary current, pumps or powerful internal filters can be used. In such an environment with artificial current, only undemanding plant species, such as Anubias, as well as various mosses and ferns, can successfully grow. Since Opsarius dogarsinghi originates from flowing waters, it needs clean, oxygen-rich water. For long-term keeping of these fish, it is important to ensure enhanced aeration, prevent the accumulation of organic waste, and maintain a temperature regime within 18–24°C. One should not rely solely on the filtration system to maintain water purity; weekly partial water changes (30–50% of the total volume) with fresh water are mandatory. Since the fish are prone to jumping, a lid on the aquarium becomes a necessity.

In their natural environment, these fish feed on small invertebrates such as insects, crustaceans, and larvae. If possible, they may also eat fry. For keeping in a home aquarium, it is recommended to offer high-protein foods, which should be supplemented with live or frozen bloodworms and similar products.

Cases of successful breeding of this species in aquarium conditions have been recorded, however, detailed information on stimulation methods and specific process parameters is currently unavailable. In nature, these fish are rheophilic species, so spawning likely requires conditions that mimic flowing waters with clean, oxygen-rich water and a stony substrate.

The species is extremely sensitive to water quality and the accumulation of organic waste, which often leads to bacterial infections and a deterioration of overall health. To prevent diseases, it is necessary to maintain a high level of dissolved oxygen, ensure active water circulation, and strictly adhere to a schedule of regular water changes. Fish are prone to stress when environmental parameters are unstable, so they should not be placed in biologically immature aquariums.

When selecting individuals, attention should be paid to their activity and the integrity of their skin. Healthy fish should exhibit typical species behavior, actively swim in the water column, and show no visible damage to fins, ulcers, or spots on the body. Avoid purchasing specimens that appear lethargic, stay near the surface, or show signs of emaciation, as this species tolerates transportation and adaptation to new conditions poorly.