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Callichthys callichthys

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Contents of this page belong to www.fishlookup.com The cascarudo (Callichthys callichthys), armored catfish, bubblenest catfish, hassar, or mailed catfish is a subtropical freshwater fish belonging to the Callichthyinae sub-family of the Callichthyidae family.

It was originally described as Silurus callichthys by Carolus Linnaeus in 1758.[1] It is likely to represent a species complex.[2]

C. callichthys is distributed in all major river drainages of South America.[2] It is very wide ranging, extending from Trinidad to Buenos Aires, Argentina, including the upper Amazon River and Paraguay River systems.

The fish will grow in length up to 8 inches (20 centimeters). The females are larger and more robust and are a dull olive-green, while the males are brighter in color, exhibiting a delicate blue or violet sheen laterally with a more developed and longer pectoral fin spine that is reddish brown and edged with orange or reddish orange.