Schwartzi Corydoras Overview

Dive into the enchanting world of the Schwartzi Corydoras, a tropical freshwater fish beloved by aquarists worldwide. Often recognized by names such as Schwartzi Cory, Schwartz’s Cory Cat, or simply Schwartz Cat, this compelling species finds its roots in the inland waters of South America. Home to the tranquil tributaries and calm creeks of the Purus River basin in Brazil, the Schwartzi Corydoras brings a piece of this serene environment to any freshwater aquarium.

Origins and History

The Schwartzi Corydoras was first described by F. Rossel in 1963. Its unique species name is a tribute to Willi Schwartz, the Brazilian collector who introduced this species to the world in 1962. The genus name, ‘Corydoras’, derived from the Greek words ‘cory’, meaning helmet, and ‘doras’, meaning skin, paints a vivid picture of this fish’s armored exterior.

Belonging to the Callichthyidae family within the Siluriformes order of the Actinopterygii class, the Schwartzi Corydoras proudly wears two rows of bony plates rather than scales along its flanks. These distinguishing features lend a sense of armored protection, echoing the essence of its Greek name.

Habitat and Tank Conditions

Endemic to quiet and shallow waters, the Schwartzi Corydoras enjoys conditions akin to sand banks, tributaries, creeks, and flooded forests. Ideal water parameters for this peace-loving bottom dweller include:

  • A pH range of 6.5 – 7.5
  • Water hardness between 4 – 19 dGH
  • Temperature between 72 – 79 °F

When setting up an aquarium for Schwartzi Corydoras, bear in mind their love for spacious surroundings. A minimum 10-gallon tank with ample swimming area is recommended. Furthermore, these fish thrive in well-planted tanks with elements of bogwood, a dark substrate, and subdued lighting. Always keep in mind that these sociable creatures prefer the company of 3 to 5 of their own kind or more. They are sensitive to poor conditions and can lose their barbels if kept in a poorly maintained habitat. Smooth sand or gravel substrates are ideal as they help protect the fish’s barbels from injury.

Suitable Tank Mates

Given their peaceful nature, the Schwartzi Corydoras should not be kept with large or aggressive fish species. They cohabitate best with small characins, cyprinids, anabantoids, dwarf cichlids, and other peaceful catfish.

Diet and Feeding

Schwartzi Corydoras have an omnivorous diet, relishing a mix of plant and meaty foods. In their natural habitat, their meals comprise small worms, benthic crustaceans, insects, and decaying animal and plant matter. In captivity, this species readily accepts a variety of food sources such as flake, freeze-dried, frozen, live foods, and pellets. As scavengers, these fish contribute to a clean tank by consuming leftover food and decaying plant matter.


Breeding Schwartzi Corydoras within an aquarium setting is a rare but fascinating spectacle. To encourage spawning, ensure the water quality is optimal with a pH of 6.5, nitrite of 0 ppm, nitrate of 10 ppm, and a temperature around 75°F.

For successful breeding, certain conditions must be met within the tank. A substrate of sand or fine gravel is needed to mirror the fish’s natural environment. The addition of an air-powered sponge or box-type filtration system is recommended, as these closely simulate the gentle current found in the fish’s native waters. Clumps of vegetation, such as java moss, provide ample hiding spots and mimic the dense plant life where the female typically lays her eggs.

Interestingly, female Schwartzi Corydoras lay sticky eggs within this dense vegetation. Unlike many fish species, the adults do not guard the eggs. Post-spawning, it is important to promptly remove the parents from the breeding tank to prevent them from consuming the eggs—a rather common occurrence in the fish world.

The eggs typically hatch within a span of 3-5 days. Once the fry are free-swimming, they can be fed with nutritious, easily digestible food such as newly hatched brine shrimp nauplii. Patience, proper care, and attention to detail can lead to a successful breeding experience with Schwartzi Corydoras, bringing the joy of witnessing the lifecycle of these enchanting creatures right into your aquarium.

Identifying Males and Females

Identifying the sex of your Schwartzi Corydoras is a straightforward task when viewed from above. The females are noticeably rounder and broader in their body shape compared to their male counterparts. Males, though slightly smaller, stand out with their larger pectoral fins.

Health and Disease Prevention

Like all aquarium inhabitants, the Schwartzi Corydoras can be susceptible to certain health issues, most notably barbel erosion and skin flukes. High water quality is the best line of defense against these problems. Regular water changes and a keen eye on water parameters will help keep your Schwartzi Corydoras healthy and active.

Fungal and bacterial infections, while not common, can also occur. If any unusual behavior or physical symptoms appear, promptly consult a professional or a fish disease guide for diagnosis and treatment options.

Popularity and Trade

Schwartz’s catfish, owing to its favorable size, amicable personality, and attractive markings, has gained immense popularity in the aquarium trade. These fish are especially valued for community aquariums.

However, Schwartzi Corydoras are more expensive than other Corydoras as they are not typically bred commercially. So if you’re considering adding these unique fish to your aquarium, be prepared for a higher price tag.


The Schwartzi Corydoras offers a slice of South American river life to your aquarium with its endearing character, intriguing history, and unique features. Although they may require some extra care compared to other freshwater species, their enchanting presence is well worth the effort. Whether you’re a beginner aquarist or a seasoned fish-keeper, these remarkable fish make an enriching addition to any peaceful community aquarium.

FAQ Section

Q1: Can Schwartzi Corydoras live with other fish?
A: Yes, Schwartzi Corydoras are peaceful fish that coexist well with other non-aggressive species, such as small characins, cyprinids, anabantoids, dwarf cichlids, and other peaceful catfish.

Q2: What do Schwartzi Corydoras eat?
A: They are omnivorous and can eat a variety of foods, including small worms, benthic crustaceans, insects, and decaying plant and animal matter in the wild. In captivity, they accept flake, freeze-dried, frozen, live foods, and pellets.

Q3: How can I tell the difference between male and female Schwartzi Corydoras?
A: When viewed from above, females have a noticeably rounder and broader body. Males, on the other hand, are slightly smaller with larger pectoral fins.

Q4: Can Schwartzi Corydoras be bred in an aquarium?
A: Yes, although it’s not common. With the right conditions—good water quality, fine substrate, appropriate filtration, and plenty of vegetation—successful breeding is possible.