Corydoras zygatus

In appearance and body pattern, this species resembles its close relative, Corydoras rabauti. The differences between them are minor: Corydoras zygatus is slightly larger, reaching a length of 6–7 cm, and the dark stripe on its back, characteristic of both species, does not extend to the base of its tail. Its silvery body coloration sometimes takes on orange hues, especially under certain lighting.

The species inhabits the western part of the Amazon River basin in South America. It prefers freshwater bodies with clear water, where it leads a bottom-dwelling lifestyle. In its natural habitat, water parameters typically vary widely due to seasonal changes in tropical river systems.

A peaceful schooling fish, most active at dusk and at night. In an aquarium, it is recommended to keep a group of 5–8 individuals, as solitary fish become timid and less active. The species is well compatible with other calm aquarium inhabitants that occupy the middle and upper water layers.

Like many members of the genus Corydoras, this catfish is considered an excellent choice for beginner aquarists. It is undemanding to care for and demonstrates high adaptability to various conditions, provided that changes occur gradually. For example, the fish feels comfortable in both soft, slightly acidic water and harder, slightly alkaline water; however, direct transfer from one environment to another without acclimatization is unacceptable. Changes in hydrochemical parameters should be gradual. Maintaining a healthy biological environment in the aquarium directly depends on reliable equipment, regular weekly partial water changes, and timely removal of organic waste such as excrement and uneaten food. The optimal aquarium volume for a group of 4–6 individuals starts from 80 liters. The decor can be anything, but the key is to have a clean, soft substrate and several hiding places, which can be created from driftwood, dense plant thickets, or any other decorative elements, both natural and artificial. Regarding diet, this catfish readily accepts most common aquarium foods: dry, freeze-dried, frozen, and live. A varied diet, including a combination of several types of food, will be highly beneficial. Behavior and compatibility: Corydoras zygatus is a peaceful and friendly fish. It enjoys being in the company of its own kind, so it is recommended to acquire a group of at least 4 individuals. Due to its calm temperament and ability to adapt to diverse conditions, this catfish will be an excellent tankmate for many other species of aquarium fish.

An omnivorous species, feeding on small invertebrates, insect larvae, and detritus in nature. When kept in an aquarium, the diet should consist mainly of high-quality sinking foods: catfish tablets, granules, or flakes. It is recommended to periodically supplement the diet with live or frozen foods, such as bloodworms or Artemia, to maintain health.

Breeding is typical for members of the genus. Spawning is stimulated by water changes to softer and fresher water, as well as by imitating seasonal temperature changes. The female lays eggs on a substrate, for example, on broad plant leaves or aquarium glass. There is no parental care for the offspring, so it is recommended to remove the parents after spawning.

Fish are sensitive to water quality and substrate condition. The presence of sharp particles in the substrate can lead to damage to their sensitive barbels, which opens the way for bacterial infections. The species tolerates elevated salt concentrations in the water poorly, the use of which is contraindicated in the treatment of some diseases.

When purchasing, choose active fish with clean fins and no visible skin damage. It is important to pay attention to the condition of the barbels: they should be intact and show no signs of erosion. It is not recommended to acquire individuals that appear emaciated or show signs of apathy, as this may indicate health problems.