1. Catfish has small eyes, flat head and long body. The mouth is in the lower position and the mouth is small. Finally, it only reaches the lower position in front of the eyes. Adult catfish have two pairs of beards, a pair of ***4. Maxillary beard can extend to the last position of pectoral fin, and mandibular beard is shorter. There are no adult catfish, only three pairs of beards. Catfish's jaws are all raised, and the gap between teeth is very small, showing the appearance of fluff. Jaw teeth and pear teeth are arranged in an arc belt, pear bone teeth are uninterrupted, and there are some depressions in the middle of the back. Catfish has a lot of mucus, no fat fins, a long anal fin and a tail fin at the back. Catfish are usually dark brown or gray-black, with slight dark cloud spots.

Catfish is a fierce fish at the bottom of the sea. Afraid of light, I like to live in crevices, deep pits, earth caves or caves at the bottom of tree roots, and slow flowing water near rivers. In the still water of reservoirs, ponds, lakes and weirs, most of them lie at the dark bottom or under pieces of water hyacinths, peanuts and water hyacinths. In spring, activities and foraging begin. After winter, it doesn't eat, but lurks in deep water or caves for the winter. If nothing bothers it, it usually can't swim. Catfish have small eyes and weak eyesight. They lie down during the day and go out at night. They hunt by smell and two pairs of tentacles. They are very greedy. The hotter the weather, the greater their appetite, and they are active on cloudy days and at night.