While not all catfish have sandpaper-like skin, many species, especially those in the family Ariidae, have dermal denticles that feel rough and abrasive, similar to sandpaper. These denticles are tiny, tooth-like structures embedded in their skin.
Here are some other types of fish that can have rough skin:
* Sharks: Sharks have tough, sandpaper-like skin covered in denticles called dermal denticles.
* Rays: Similar to sharks, rays also have dermal denticles.
* Some species of bream: These fish can have rough, sandpapery scales.
Let me know if you have any other fish trivia questions!