Catfish (pictured): long body, flat head and flat tail. Under the mouth, the mouth fissure is small, and the end only reaches below the anterior margin. Mandibular protrusion. The teeth are thin and fluffy, and the jaw teeth and pear teeth are arranged in curved strips with pear bone teeth.
The belt is continuous, and the middle of the tail edge is slightly concave. Small eyes and thick skin. Adult fish have 2 pairs of 4 whiskers, the upper jaw can reach the end of pectoral fin and the lower jaw is short. There are three pairs of chin whiskers in the juvenile stage. When the body length is about 60 mm 1, the chin whiskers begin to disappear, and the catfish is sticky and scaleless. 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.
Snakehead (pictured): The front of the body is cylindrical and the back is flat. The head is long, slightly flat at the front and slightly higher at the back. The kiss is short, round and blunt, with a big mouth, an end position, a slightly oblique mouth crack and a slightly protruding jaw. The teeth are small, the upper and lower jaws are banded, and the teeth on both sides of the mandible are firm. Small eyes, high in position, in the first half of the head, very close to the nose and mouth. There are two pairs of nostrils, the front nostril is tubular at the snout, and the back nostril has a small round hole above the eyes. The branchial fissure is large, the left and right branchial membranes are healed, the branchial harrow is short and sparse, and there are auxiliary branchial devices on the left and right above the branchial cavity, which can breathe air. The body color is gray-black, the back and head are dark, the abdomen is pale, there are irregular black patches on both sides of the body, and there are two rows of black stripes on both sides of the head. Odd fins have black and white spots, and lateral fins are grayish yellow with irregular spots. The body is covered with medium-sized scales, round scales, and the top of the head is covered with irregular scales. The lateral line is straight, the general plan on the anus is twisted, and the scales move down two rows, running in the middle of the body and extending to the tail.