Nothobranchius kirki

Adults of this fish can reach a size of 5–6 cm. Males are distinguished by bright blue scales edged with contrasting red stripes. In the posterior part of the body and on the fins, red hues become more pronounced. The caudal fin is completely devoid of blue tones. Females, on the other hand, are much more modestly colored, their main color being light gray.

Nothobranchius kirki is native to the African continent, specifically the rift valleys of modern-day Malawi and Mozambique. They inhabit river systems that flow into lakes such as Chilwa and Chiuta. The natural habitat of these fish consists of shallow streams with silty substrates that periodically dry up.

Males of this species are characterized by a pronounced temperament and do not tolerate the presence of rivals in their territory. In small aquariums, it is recommended to form a group of one male and several females. Nothobranchius kirki are compatible with other peaceful species capable of coexisting in similar confined conditions. However, avoid keeping them with closely related species.

For keeping 3–4 fish, an aquarium of 30–40 liters with a depth of about 25–30 cm is sufficient. When decorating, preference is given to dark, soft substrate. If breeding is planned, a special removable spawning substrate suitable for Killifish must be provided. Dense plant growth and driftwood will serve as excellent hiding places. Additionally, floating plants will help prevent fish from jumping out and provide moderate shading for the aquarium, as bright light can negatively affect their coloration. Keeping this species is relatively simple; they are considered hardy, but this does not negate the need for regular aquarium maintenance. It is important to systematically change a portion of the water and remove organic waste, such as food remnants and excrement.

The exact composition of these fish's daily diet should be clarified with the seller. As a rule, live and frozen foods form the basis of their diet, but some breeders successfully acclimate them to dry alternative foods.

In natural conditions, spawning occurs towards the end of the wet season. Eggs are laid on soft substrate. When the body of water dries up, fertilized eggs enter a state of diapause, which lasts several months until the first rains. When breeding at home, it is necessary to replicate these natural changes. A few days after spawning is complete, the substrate layer with eggs is removed from the water, gently squeezed, and placed in an open container for further drying at a temperature of 20–22°C, bringing it to a slightly damp state. Then the substrate with eggs is transferred to a closed container and stored in a dark place for 5 months. At the end of the incubation period, the eggs are flooded with water at 18–20°C, and fry appear within a few hours. Gradually, the water temperature is raised to 26°C.

The fish are hardy and undemanding. Diseases usually manifest only with a significant deterioration in keeping conditions. In a balanced aquarium ecosystem, health problems are generally absent.

When purchasing, choose active fish with clean fins and no visible body damage. It is important to consider the seasonal life cycle of the species: young individuals are often sold in stores, as the lifespan of adult fish is short. It is recommended to clarify the keeping conditions and current diet with the seller, as adaptation to new conditions can be difficult. Avoid individuals with signs of emaciation or sluggish behavior, as due to their short life cycle, any diseases or stress during transport can lead to rapid death.