Question

Why do catfish not have scales?

Answer 1

Catfish:

1. Catfish bodies are often naked.
2. In some species, saliva-covered skin is used for skin respiration, in which the fish breathes through its skin.
3. Fish that do not have scales mainly belong to the family of catfish, kingfish, and sharks.
4. Instead of scales, these fish have other layers of material on their skin.
5. These fish may have bone plates that are covered with other layers, or they may have small tooth-like protrusions covering their skin.