1. Catfish. There are many kinds, including catfish (native catfish), bearded catfish (pond catfish) and leathery bearded catfish (Egyptian bearded catfish), commonly known as pond slippery fish in Hakka.

2. Catfish, the animal kingdom-Chordata-Chordata subfamily-Kiwifruit-Siluriformes-Siluridae-Siluridae-catfish species. There are four beards on the mouth, long on the top and short on the bottom. They are carnivorous, mostly wild, and have low requirements for water quality, so they can be cultured artificially.

3. Pinctada is the main catfish species in North America. Its official origin is Missouri, Iowa, Nebraska, Kansas and Tennessee, commonly known as the pincer cat.

4. Catfish has a long snout with a conical snout, which obviously protrudes forward. Lower mouth, crescent shape, thick lips and small eyes. It must be four pairs, the small one. Scale-free, dorsal fin and pectoral fin are serrated at the posterior edge of spinous process, fat fin is thick, caudal fin is deeply forked, body color is pink, back is slightly gray, abdomen is white, and fins are gray-black.

5. Different species in the same family have similar general morphology and habits. There are several kinds of catfish, such as the leatherbeard catfish and the southern catfish, but compared with the river catfish, the most obvious point is that it has a fat carp fin like the carp fish, but the catfish does not.