Mimagoniates barberi

Adults reach a size of 4–5 cm in length. Males are generally somewhat larger, while females have a more slender build. Overall, sexual dimorphism is weakly expressed. Their appearance is similar to another closely related species — the Blue Tetra. Blue tones are present in the body and fin coloration, effectively showing up against a gray-silver background. A distinctive feature is a dark stripe that runs from the head to the tail.

The homeland of this fish is South America. It can be found in the Paraná River basin, in the vastness of the southern Brazilian states, in Paraguay, and in the northern regions of Argentina. These fish usually inhabit small streams and rivers, preferring areas with abundant aquatic vegetation. Often, the bottom of such bodies of water is covered with silty areas, numerous snags, fallen leaves, and other plant debris. The high content of organic substances contributes to the saturation of the water with tannic components, which give it a rich brown color, sometimes even resembling dark coffee.

Mimagoniates barberi tetras are known for their high activity. Males can actively pursue females, and in a small aquarium where there are not enough hiding places, this can lead to exhaustion and even death. It is recommended to acquire a school of at least 10 individuals so that the males' attention is evenly distributed. It is desirable that the number of males be less than the number of females. These fish show a peaceful attitude towards other species.

For a school of 8–10 individuals, the optimal aquarium volume starts from 100 liters. Given their high activity, a larger volume will only be beneficial. In the aquarium design, care should be taken to provide an abundance of aquatic vegetation (both live and artificial) and various shelters. Snags are ideal for this role. Mimagoniates barberi are excellent jumpers; in nature, they use this ability to escape predators and in case of any other threat. To prevent jumping out of the aquarium, it must be equipped with a lid. You can also place thickets of floating plants on the water surface. Floating plants will provide excellent shading, which is especially relevant since the light level in their natural environment is quite low due to the dark water. Leaves of some trees, such as oak, alder, or Indian almond, will help recreate natural conditions. During their decomposition, tannins and other humic substances are released, which give the water a characteristic brown tint and simultaneously help lower the pH level. To keep the fish long-term, it is important to monitor the hydrochemical parameters of the water within the acceptable range, avoid dangerous increases in the concentration of nitrogen cycle products, and ensure constant warmth and cleanliness of the water. For this purpose, necessary equipment, in particular a filtration system, is installed, and regular aquarium maintenance is carried out.

Being an omnivorous species, these fish readily accept most common aquarium foods of appropriate size. Their daily diet can include both dry, frozen, or live foods, as well as various combinations thereof.

When conditions are favorable (balanced diet, suitable water composition), spawning is not uncommon. The female lays eggs in plant thickets, and the male fertilizes them. Parental instincts are not developed in these fish; they do not care for either the clutch or the hatched fry and may eat them. To preserve the offspring, the eggs must be transferred to a separate tank. This tank should be filled with water from the main aquarium and equipped with a simple filtration system, for example, an air-driven filter. The incubation period usually takes several days. In the first days of life, the fry are fed specialized products in the form of a suspension or powder, then their diet can be enriched with Artemia nauplii or similar foods.

A balanced aquarium biosystem and optimal keeping conditions serve as the best guarantee against various diseases. If you notice changes in the fish's behavior, color, or the appearance of unusual spots and other symptoms, the first step should be to check the water parameters, and only then should treatment begin. More detailed information on symptoms and treatment methods is presented in the "Aquarium Fish Diseases" section.

When choosing individuals, pay attention to the cleanliness of the skin, the absence of white spots, ulcers, or fin damage. A healthy fish should be active, exhibit schooling behavior, and have a good appetite. Avoid buying fish that look emaciated, stay alone near the surface, or show signs of apathy.

• check for signs of infectious diseases on the body and gills
• prefer individuals with bright, species-typical coloration
• observe their behavior in the store to rule out timid or lethargic specimens