The catfish is one kind of appearance quite unusual fish. Compared with other fish, catfish has many outstanding characteristics. When we look at catfish, we find that they actually don't have scales on their bodies, and their scales have deteriorated. Therefore, if we classify them from the aspect of fish scales, we can divide them into scaleless fish.
Fish scales are one of the important structures of fish. The most important role of fish scales of other fish is to protect their bodies from the invasion of some bacteria and harmful substances in the water. Catfish, on the other hand, do not have scales, so many people wonder how they protect their bodies. In fact, although catfish do not have scales, but their body surface has some mucus glands, these mucus glands can secrete a lot of mucus, these mucus can replace the scales to protect the catfish body, prevent bacteria from invading the fish body. In addition, these catfish can also reduce the resistance of catfish in the water, so that they can be more labor-saving when they are active.
In addition to fish scales, fish spines are also one of the important structures of fish. Unlike fish scales, fish bones exist in almost all fish and play an important role. Catfish also have spines in their bodies, which play an important supporting role. In the premise of the role of fish bones, catfish can complete the normal life activities such as predation, if there is no fish bones, catfish can not normal activities. However, among all fish, catfish do not have a lot of bones. Because of the rich nutrition of catfish, it is welcomed by many people.
