Cascarudo

I'm sorry for any confusion, but without a specific definition, it's challenging to provide details on "Cascarudo." In general, the term could refer to various things in different contexts, including a type of fish common in Spanish-speaking countries. Assuming you're referring to a kind of fish often known in English as an "armored catfish" or members of the Loricariidae family, here's a brief summary:

The Cascarudo or armored catfish typically sports a brownish or grey coloration, camouflaging well with riverbeds. Originating from freshwater habitats in South America, these fish have a distinctive appearance characterized by their bony plates, which serve as armor, covering their bodies. They are not particularly well-known outside of their native regions but hold some interest among exotic fish hobbyists due to their unique appearance and the fact they help clean tanks by eating algae. However, they require specific care and are not as popular or commonly kept as other aquarium fish.