Dario kajal

Adults of this species reach a length of approximately 2 cm. The coloration is most often reddish, with a pattern of dark speckles visible on the back. The edges of the dorsal and pectoral fins are adorned with a turquoise border. A distinctive feature of the species is the black streak near the eyes, which is reflected in its name: "Kajal" (kajal) in Hindi means "black eyeliner," traditionally used by Indian dancers. Females are characterized by less vibrant coloration; their hues are gray or silvery, with a barely noticeable red pigment that gives them a pale pink tint.

The fish originates from Asia. Its first specimens were collected in the Meghna River basin, one of the three largest rivers in Bangladesh. However, the individuals later given the scientific name were discovered in the Indian state of Meghalaya, located on the northeastern border with Bangladesh. Dario kajal prefers to inhabit small streams and rivers characterized by calm currents, murky water, and a moderate amount of aquatic vegetation. The climatic conditions in these regions are characterized by abundant rainfall, which leads to significant annual fluctuations in water composition and river levels.

Males compete with each other for territory and the attention of females. For this reason, it is not recommended to keep more than one male in a small aquarium. These fish are calm and unhurried, which makes them vulnerable in competition for food with more active tankmates. When choosing tankmates, only very small and peaceful species should be considered, such as Rasboras or Guppies.

For a group of 3–4 fish, the optimal aquarium volume starts from 40 L. Soft substrate is used as decor, and shelters are created from natural snags, as well as fallen leaves of certain trees. Plants that can grow on snags, such as Anubias, as well as various aquatic mosses and ferns, are well-suited. For planting on the substrate, Cryptocoryne species can be chosen. Water parameters such as pH and GH can be within a relatively wide range. However, temperature is of great importance: comfortable values are considered to be 16–24°C. Elevated temperatures negatively affect the well-being of the fish, leading to loss of coloration and increased susceptibility to diseases. Thus, Dario kajal can be kept in aquariums without additional heating, but cooling may be required during warm summer months. In their natural habitat, these fish feed on small aquatic crustaceans, worms, insect larvae, and other zooplankton. They usually do not accept dry foods. In a home aquarium, it is necessary to offer live or frozen brine shrimp, daphnia, and similar foods. It has been noted that bloodworms can cause digestive problems and, as a result, lead to the development of diseases.

In natural conditions, these fish feed on small aquatic crustaceans, as well as worms, insect larvae, and other zooplankton. They usually do not accept dry foods. In a home aquarium, live or frozen brine shrimp, daphnia, and other similar foods should be offered. It has been observed that bloodworms can cause digestive problems, which in turn can lead to the development of various diseases.

The reproduction of these fish follows a similar pattern to other members of the genus, such as Badis scarlet or Dario red. As the breeding season approaches, the male occupies a specific area on the aquarium bottom, choosing a shelter as the center of his territory, and begins to attract females. Even in large aquariums with several males, usually only one dominates and participates in spawning. After successful courtship, the female lays her eggs on the underside of a leaf, and her role in spawning ends there. The male remains near the clutch, providing protection throughout the incubation period, which lasts 2–3 days. The hatched fry feed on their yolk sac for about a week, and then begin to swim actively in search of food. Micro-foods such as infusoria are suitable for feeding them, followed by brine shrimp nauplii or specialized suspensions and powders for fry. It is more convenient to raise the young in a separate tank.

Dario kajal have sensitive digestion, so improper nutrition is the main cause of disease development in this species. The use of bloodworms in the diet often leads to serious gastrointestinal disorders. Fish are also extremely susceptible to water quality in elevated temperatures: a violation of the temperature regime (above 24°C) weakens the immune system, provoking loss of coloration and the development of infections.

When choosing fish, pay attention to their activity and the condition of their body surface. Healthy individuals should show curiosity and explore the bottom, rather than constantly hiding in the corners of the aquarium. Avoid purchasing fish with signs of emaciation, damaged fins, or a film on their body. It is important to note that Dario kajal may be very frightened in the store, so their pale coloration in a stressful situation is normal, but the fish should appear well-fed and active.