Corydoras Robustus

Datasheet

General Description

There are over 180 described species of Corydoras, commonly known as "corys," making it one of the most diverse South American fish genera. They are peaceful, bottom-dwelling armored catfish with bony plates instead of scales and sharp pectoral fin spines. Corys are facultative air breathers and can gulp air from the surface. The Corydoras Robustus, also known as the Robust Cory, is one of the largest species in the genus, with males developing an extended first dorsal fin ray.

Aquarium Setup

Corydoras Robustus thrives in Amazon biotope tanks with river sand substrate, driftwood branches, twisted roots, and dried leaves to stain the water. Alternatively, they do well in well-planted tanks without aquatic plants. Peat in the filter can simulate black water conditions, and dim lighting is preferred. It is crucial to maintain clean conditions, avoid undergravel filtration, and ensure the substrate is clean to prevent barbel infections.

Behaviour

Corydoras are very peaceful and suitable for community tanks, but shouldn't be housed with large or aggressive species. They do best in groups of at least six and are more active in the presence of conspecifics. Most species are benthic, bottom-dwelling fish, though some inhabit open water. They are not effective cleaners and require sinking varieties of food to thrive. Corys exhibit spawning behavior characterized by increased activity, pursuit between males and females, and egg-laying on tank surfaces.

Feeding and Diet

Corydoras are omnivorous and easy to feed, accepting sinking pellets or tablets as staples. Their diet should include live and frozen foods like Daphnia, Artemia, and bloodworms. Proper nutrition is essential to prevent barbel infections, especially in dirty tank conditions.

Reproduction & Dimorphism

Breeding Corydoras involves setting up a tank with appropriate substrate, filtration, and vegetation, conditioning the fish with a varied diet, and inducing spawning with cooler water changes. Males and females exhibit distinct characteristics, with females being rounder and broader-bodied, especially when full of eggs. Eggs are usually laid on tank glass, and fry accept microworms and brine shrimp nauplii as first foods.

Habitat and Distribution

Corydoras Robustus is endemic to the Rio Purus drainage in Brazil. They inhabit small tributaries, creeks, flooded forest areas, and sand banks. The species thrives in water conditions with a pH of 6.0-7.0, hardness of 1-12 dH, and temperatures ranging from 22-26°C.