Cascudo is a common name for several species of freshwater fish belonging to the family Loricariidae, primarily found in rivers and streams across South America. These fish are known for their distinctive flattened bodies and armored plates, which help protect them from predators. They are often found in various habitats, including rocky and sandy bottoms, where they feed on algae and detritus. Cascudos are popular in the aquarium trade due to their unique appearance and beneficial role in maintaining tank cleanliness. They are often referred to as "suckermouth catfish" because of their specialized mouths that allow them to graze on surfaces. Some well-known species include Hypostomus plecostomus and Pterophyllum scalare.