The appearance characteristics of pincers: channel catfish is long, the front is wider than the back, the head is smaller, the snout is slightly sharp, the mouth is sub-terminal, the body surface is smooth and scaleless, the mucus is rich, the lateral line is complete, and the skin has obvious lateral line holes. There are four pairs of dark gray tentacles in the upper and lower jaws of the head, including 65,438+0 pairs of nasal whiskers, 65,438+0 pairs of jaw whiskers and 2 pairs of whiskers with different lengths. The jaw whiskers are the longest, and the nose whiskers are the shortest. The branchial foramen is large, the branchial membrane is not connected with the isthmus, there are obvious irregular spots in the H part, and the spots of individuals weighing more than 0.5 kg disappear. Lipid fin 1 strip, caudal fin is deeply bifurcated, and each fin is dark gray. The backs on both sides of the body are light gray, and the abdomen is milky white. There are obvious irregular spots on both sides of the young fish, and the spots on the adult fish gradually become inconspicuous or disappear.
Appearance characteristics of catfish: the mouth is low, the mouth crack is small, and the end only reaches below the front edge of the eye. Mandibular protrusion. The teeth are thin and fluffy, and the jaw teeth and pear teeth are arranged in arc bands. The tooth bands of pear bones are continuous, and the middle part of the trailing edge is slightly concave. Small eyes and thick skin. Adult fish have 2 pairs of 4 whiskers, and the maxillary whiskers can reach the end of pectoral fin. Catfish are sticky and have no scales. The dorsal fin is very small, without spines, with 4 ~ 6 fins. Fat-free fin The anal fin is very long, and the rear end is connected with the caudal fin. Catfish are usually dark brown or gray-black, with slight dark cloud spots.