Bolivian Corydoras

Adult specimens of this fish typically reach a length of about 6 cm. Their morphology is typical of Corydoras species: they have a short, stocky body protected by rows of bony plates. Their coloration is variable. As they grow and depending on environmental conditions, the body pattern can transform from a distinct reticulated pattern to a solid color, with barely discernible dark vertical stripes. Sometimes, in addition to the predominant silvery and gray tones, emerald hues may appear, giving the fish a greenish sheen.

The species is endemic to South America, inhabiting the Mamoré River basin in Bolivia. In nature, it lives in rivers with moderate currents and flooded areas of tropical forests. It prefers to stay in the bottom layers of the water, hiding among aquatic vegetation and snags.

This fish is distinguished by its peaceful and calm disposition, preferring to live in a group of its own kind. It coexists perfectly with other non-aggressive species of comparable size, such as cyprinids, characins, and other small catfishes.

For a group of 3–4 fish, the optimal aquarium volume starts from 50–60 liters. A soft substrate is recommended for decoration, and lighting should be subdued (or shaded by floating plants). It is important to provide hiding places that alternate with open areas on the bottom. Since these catfishes are bottom dwellers and regularly dig in the substrate, it is extremely important to prevent the accumulation of organic waste (dirty substrate) during long-term keeping and to avoid using a bottom filter if possible.

In its natural habitat, it is omnivorous, feeding on small invertebrates, insect larvae, and organic detritus. In aquarium conditions, the diet should be varied and include:

• high-quality dry foods in the form of sinking tablets or granules for bottom fish;
• frozen foods, such as bloodworms, Artemia, or tubifex;
• live foods as a supplement to maintain activity.

Breeding is typical for the genus. Spawning is paired or group, stimulated by fresh water changes and a decrease in temperature, mimicking 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 for the offspring, so the parents are recommended to be removed after spawning. Fry feeding begins after the yolk sac is absorbed, using Artemia nauplii or specialized micro-foods.

Fish have strong immunity when kept under proper conditions. The most common problems are related to poor aquarium hygiene and damage to 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 cleanliness. They are sensitive to sudden changes in hydrochemical parameters and high concentrations of nitrogenous compounds.

When selecting individuals in a store, attention should be paid to the activity of the fish and the integrity of their skin. Healthy corydoras should be active, without visible ulcers, spots, or fin damage. It is important to inspect the barbels: they should be long and show no signs of erosion. It is not recommended to purchase fish from aquariums where dead individuals are present or signs of mass diseases are observed, as transport stress can provoke the development of hidden infections.