Corydoras acutus

The body shape of Corydoras acutus can vary depending on its specific origin. Some researchers suggest that this common name may actually encompass a range of species, including recently discovered ones that have not yet received official scientific descriptions, known by the numbers C024, C077, and C109. The main distinguishing features of this species, as mentioned earlier, are a prominent black mark on the dorsal fin and a somewhat elongated snout. The body coloration is typically gray, speckled with numerous small black dots. Under certain lighting, a slight emerald sheen can be observed on the head.

The species inhabits the Amazon River basin in Peru, Ecuador, and Brazil. It is found in various river systems, including the tributaries of Napo, Marañón, and Madeira. It prefers areas with slow currents, where it stays in the bottom layers of the water. In nature, water parameters vary widely, with the fish adapted to a tropical climate with temperatures of 22–28 °C.

A peaceful and active schooling fish that thrives best in groups of 6 or more individuals. The catfish spend most of their time exploring the substrate in search of food. They are highly compatible with most small and non-aggressive fish species that inhabit the mid-water or surface. Intraspecific conflicts are rare and usually limited to displays of dominance.

Corydoras are among the most undemanding aquarium fish. They can adapt to a fairly wide range of hydrochemical water parameters and do not have strict requirements for aquarium setup – soft substrate and a few shelters are sufficient. Their diet can include almost any suitable size food. Thanks to their peaceful nature, these catfish do not create problems when choosing tank mates. It is only important to avoid keeping them with overly large, territorial, or aggressive predatory fish. Aquarium care for the Largespot Corydoras is standard and suitable for most other fish species. The key condition is maintaining a stable aquatic environment, which is ensured by reliable equipment operation and regular performance of essential procedures, such as weekly partial water changes and removal of organic waste.

An omnivorous species that feeds on small invertebrates and organic detritus in nature. In the aquarium, it accepts most types of sinking dry foods, as well as frozen and live foods such as bloodworms or tubifex. It is important to provide a varied diet and ensure that the food reaches the bottom, as the fish are not able to fully feed on the leftovers of other inhabitants.

Breeding follows the typical Corydoras pattern. Spawning is stimulated by water changes with a decrease in temperature. The female holds the eggs between her pelvic fins while the male fertilizes them, after which she attaches them to the substrate. The process repeats until about 100 eggs are laid. Parental care is absent, and it is recommended to transfer the eggs to a separate incubator.

This species is sensitive to water quality and substrate cleanliness. If kept in poor conditions, fin rot, fungal infections, or bacterial diseases may occur. It is important to avoid injuring the sensitive barbels with sharp substrate. Prevention includes regular substrate vacuuming, weekly water changes, and maintaining stable environmental parameters.

When purchasing, choose active fish with clean fins and no visible skin damage. It is important to ensure that the individuals have intact barbels, as their absence often indicates unsatisfactory keeping conditions in the store. Avoid fish with sunken bellies or signs of apathy, as this may indicate the presence of parasites or emaciation.