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Corydoras paleatus

Blue leopard corydoras

Small peaceful armoured catfish from South America

Photo: NiKo at German Wikipedia, Public domain, via Wikimedia Commons

The blue leopard corydoras is a small freshwater catfish native to southeastern South America. It lives in river basins and coastal streams across four countries. This hardy species is popular in home aquariums for its peaceful nature and distinctive mottled appearance.

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  • Grows to 7 cm in length
  • Produces sound using pectoral fins
  • Found by Charles Darwin in 1830s
  • Peaceful community aquarium fish
  • Lives in Paraná River basin

What it is

This fish is a member of the armoured catfish family. It grows to about seven centimetres in standard length. Females are larger than males. Males have proportionally longer dorsal and pectoral fins. The body features a mottled or peppered pattern. It belongs to the subfamily of corys within the larger catfish group. Its small size and peaceful temperament make it suitable for shared tanks.

Where it lives

The species inhabits southeastern South America. Its range includes the lower Paraná River basin. You can find it in waters within Paraguay, Argentina, and Brazil. It also lives in coastal rivers in Brazil and Uruguay. These freshwater environments provide the habitat necessary for its survival. The distribution covers multiple countries in the region.

How it lives

It feeds on a varied diet including worms, crustaceans, and insects. Plant matter is also part of its food intake. This catfish can produce sounds by moving its pectoral fins. Males use this sound during courtship rituals. Both sexes and young fish make noise when distressed. Males do not fight each other or guard mating areas aggressively. They engage in a specific T-position during courtship.

Breeding and life cycle

Reproduction involves a courtship behaviour known as the T-position. This pattern is common among related corydoras species. Males are not aggressive toward one another during this time. They do not monopolize females or specific mating zones. This lack of aggression allows for a more relaxed breeding environment compared to some other fish species.

Blue leopard corydoras
A drawing made by EveryFish from what this page says. It is a diagram, not a picture of the real fish.

Fish and people

Charles Darwin encountered this fish during his voyage on the Beagle. He found it near Buenos Aires in the 1830s. Today, it is a frequent choice for community aquariums. Hobbyists value it because it is hardy and peaceful. It coexists well with other non-aggressive tank mates. Its interesting behaviour and manageable size add to its appeal in the trade.

cory poivré
cory poivré. Photo: Sychriscar, CC BY-SA 3.0, via Wikimedia Commons
Peppered cory, Hoplisoma paleatum (Jenyns, 1842), Natural History Museum University of Pisa
Peppered cory, Hoplisoma paleatum (Jenyns, 1842), Natural History Museum University of Pisa. Photo: Mattia Nocciola, CC BY-SA 4.0, via Wikimedia Commons
Corydoras paleatus
Corydoras paleatus. Photo: Przemysław Malkowski ( :user:Pmalkowski ), CC BY 2.5, via Wikimedia Commons

Questions people ask about Blue leopard corydoras

How big does the blue leopard corydoras get?

This fish reaches a standard length of about 5.9 to 7 centimetres. Females are generally larger than males. Males have longer fins relative to their body size.

Can this catfish make noises?

Yes, it produces sound by abducting its pectoral fins. Males use this during courtship. Both sexes and juveniles make noise when they are distressed.

Where is this fish found in the wild?

It lives in southeastern South America. Its range includes the lower Paraná River basin in Paraguay, Argentina, and Brazil. It is also found in coastal rivers in Brazil and Uruguay.

Is it safe for a community tank?

Yes, it is a common choice for community aquariums. The fish is relatively hardy and peaceful. It does not show aggression toward tank mates.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Hoplisoma paleatum", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.

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Photo credits on this page

The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

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