**Pterodoras granulosus**, commonly known as the "Granulated Catfish," is a species of freshwater fish from the family Doradidae. It is native to the river basins of South America, particularly in the Paraná, Paraguay, and Amazon Rivers. This species is characterized by its bony plates along the sides of its body, providing protection from predators. These bony plates give the fish a somewhat armored appearance.

Granulated catfish can grow relatively large, sometimes reaching lengths of up to 60 cm (about 24 inches). It is a benthic (bottom-dwelling) species, feeding primarily on detritus, algae, and small invertebrates. These fish are well-suited to river systems with slow to moderate currents, where they can forage on the riverbed.

In the aquarium trade, Pterodoras granulosus is appreciated for its unique appearance and hardy nature, though it requires a spacious tank due to its potential size. Its peaceful temperament makes it compatible with many other large fish species, but it does best in a well-maintained tank with good water quality and hiding spots.

This species plays a role in local fisheries but is not considered endangered or threatened. However, like many species in the Amazon and surrounding areas, it may face challenges from habitat changes due to deforestation, damming, and pollution.