1, number of beards: Tangjiao fish has eight beards, while catfish has only four.

2. The dorsal fin is different: the dorsal fin of Tangjiao fish is more obvious, while that of catfish is less.

3. Different mouths: Tangjiao fish has a smaller mouth, while catfish has a larger mouth.

4. Different colors: the body color of Tangjiao fish is black, while the body color of catfish is yellow.

5. Different living environments: Tangjiao fish usually live in turbid waters, while catfish like to live in clear and flowing waters. Tangjiao fish generally refers to the catfish with beard, which is also called pond fish, bearded fish, bearded catfish, etc. It belongs to the phylum Chordata in the animal kingdom in biological classification. Catfish is a general name of animals under the order Siluriformes and Siluridae, also known as Hu Zi fish and pond fish. Its remarkable feature is that it has no scales all over.