Bolivian Corydoras

Adult Bolivian Corydoras typically reach about 6 cm in length. Their body structure is typical for the genus: short and stocky, protected by rows of bony plates. Coloration is variable. As they grow and depending on environmental conditions, the body pattern may shift from a pronounced reticulated pattern to uniform colouring with barely visible dark vertical stripes. Sometimes, in addition to the predominant silvery and grey tones, emerald hues may appear, giving the fish a greenish sheen.

This species is endemic to South America and inhabits the Mamoré River basin in Bolivia. In the wild, it lives in rivers with moderate flow and flooded sections of tropical forests. It prefers to stay in the lower water layers, hiding among aquatic plants and driftwood.

The Bolivian Corydoras has a peaceful and calm temperament, preferring to live in groups of its own kind. It coexists well with other non-aggressive species of comparable size, such as cyprinids, tetras, and other small catfishes.

For a group of six fish, the minimum aquarium volume is 80 litres. Use a soft substrate and keep lighting dimmed (or shaded by floating plants). Provide hiding places interspersed with open areas on the bottom. Since these catfishes are bottom dwellers and regularly sift through the substrate, it is important to prevent the accumulation of organic waste (dirty substrate) during long-term keeping and, if possible, avoid using an undergravel filter.

In its natural habitat, this species is omnivorous, feeding on small invertebrates, insect larvae, and organic debris. In the aquarium, the diet should be varied and include: — high-quality sinking pellets or tablets for bottom-dwelling fish; — frozen foods such as bloodworm, brine shrimp, or tubifex; — live foods as a supplement to maintain activity.

Breeding is typical for the genus. Spawning occurs in pairs or groups and is triggered by water changes with fresh water and temperature reduction, simulating the rainy season. The female lays 40 to 100 eggs, which she places on the substrate, plant leaves, or aquarium glass. There is no parental care, so the adults should be removed after spawning. Fry are reared after the yolk sac is absorbed, starting with brine shrimp nauplii or specialized microfoods.

These fish have a strong immune system when kept under proper conditions. Most problems relate to poor aquarium hygiene and damage to the sensitive barbels from rough or sharp substrate, which can lead to bacterial infections. Prevention includes using soft sand or fine rounded gravel, regular siphoning of the bottom, and maintaining water quality. They are sensitive to sudden changes in water chemistry and high levels of nitrogenous compounds.

When selecting fish at the shop, pay attention to their activity and skin integrity. Healthy Bolivian Corydoras should be mobile, without visible ulcers, spots, or fin damage. Inspect the barbels: they should be long and show no signs of erosion. Avoid buying fish from tanks where dead individuals are present or signs of mass disease are visible, as the stress of transport can trigger latent infections.