Gates' Danio

Adults grow to approximately 2 centimeters in length. The body of this fish is semi-transparent, allowing the silhouettes of its spine and internal organs to be clearly seen. Its coloration can vary from ash-gray to silvery, depending on how the light falls. Sexual dimorphism in the species is insignificant, making it quite difficult to distinguish males from females.

The natural habitat of this fish extends across Southeast Asia, in the southern part of Myanmar (Burma). It is likely endemic to the extensive Irrawaddy River delta, where it flows into the Andaman Sea. A characteristic feature of the Irrawaddy Delta is its flat landscape, with an elevation difference not exceeding 15 meters above sea level. This marshy lowland is dotted with numerous small channels, densely overgrown with aquatic vegetation. The water in these areas is often turbid due to the abundance of suspended silt and may have slight brackishness.

These fish are peaceful inhabitants, preferring to stay in schools of 8–10 individuals. They get along well with other freshwater species of similar size and temperament.

For keeping Gates' Danio, a relatively small aquarium, from 40 liters, but with abundant aquatic vegetation, will be suitable. The rest of the decor can be chosen at your discretion. Dimmed lighting is preferable. The presence of a large number of live plants requires an efficient aeration system. During the day, in the process of photosynthesis, plants produce oxygen and absorb carbon dioxide, but at night the situation changes: they begin to absorb oxygen, which can pose a threat of suffocation for fish. To avoid this, the aerator should be turned on at night. Aquarium maintenance includes standard procedures, the frequency and volume of which depend on the equipment and the number of inhabitants. The minimum required is a weekly partial water change with fresh water, removal of organic waste (such as uneaten food and excrement), and equipment maintenance.

In a home aquarium, these fish readily accept common foods: flakes and granules of appropriate size, as well as frozen or live daphnia, brine shrimp, and small pieces of bloodworms. It is recommended to supplement their diet with plant-based additives, such as spirulina flakes.

To date, there is no confirmed data on the successful breeding of Gates' Danio in artificial conditions. However, based on its kinship with Microdevario kubotai, a similar breeding mechanism can be assumed. Under favorable conditions in a home aquarium, spawning occurs regularly. The fish scatter their eggs among plants, showing no parental care. Approximately 72 hours later, fry emerge from the eggs left to themselves. After another 3–4 days, they begin to swim actively. It is important to note that the survival rate of the fry will be extremely low if they are not promptly transferred to a separate tank, as they may become prey for adult fish and face difficulties in finding adequate food.

In a balanced aquarium ecosystem, where all species-specific conditions are met, diseases rarely occur. Most often, diseases are provoked by deteriorating environmental parameters, contact with already sick fish, or physical injuries. If, despite all measures, the fish shows clear signs of illness, appropriate medicinal treatment will be required. A detailed description of symptoms and treatment methods is available in the “Diseases of aquarium fish” section.

When choosing individuals, attention should be paid to their activity and the purity of their coloration. Healthy fish should swim in a school, show no signs of apathy or emaciation, and have no visible damage, sores, or white film on their scales. Avoid purchasing fish that stay at the water surface, breathe heavily, or have an unnaturally bloated abdomen, as this may indicate health problems or improper keeping conditions in the store. Since this species is schooling, it is recommended to acquire a group of 6–10 individuals at once to reduce stress during adaptation to a new aquarium.