New Fish Tank Tips: Learn about the fish tank nitrogen cycle. This is a crucial process that you must understand if you want to have long term success with tropical fish.
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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. It is likely to represent a species complex.
C. callichthys is distributed in all major river drainages of South America. 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.
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