This kind of fish is called snakehead, commonly known as black fish. It is ferocious in nature, has strong fecundity and a huge appetite. It can often eat all other fish in a lake or pond, even its own young. fish. Snakehead fish can also glide on land and migrate to other waters in search of food. They can live out of water for up to three days. It is the "dish on the plate" of the Chinese people. The black fish is in the shape of a long rod. The head is flat, the head is large, and the mouth is large. The snout is round. There are many teeth in the mouth. The even fins are small, the dorsal fin and anal fin are particularly long, and the caudal fin is round. The head and trunk are covered with scales of similar size. The lateral line is intact, with a curve behind the pectoral fin. There are many small sensory holes on the top of the head, and there are more of them for big fish. The body color is gray-green on the back, gray on the belly, and there are obvious black stripes arranged in a figure-eight shape on the sides of the body. The head has three pairs of stripes extending backward.
The front part of the body of the mullet is cylindrical and the rear part is flat. The head is long, slightly flat at the front and slightly raised at the back. The snout is short and blunt, the mouth is large and terminal, the cleft is slightly oblique and extends to the lower edge behind the eyes, and the mandible is slightly protruding. The teeth are small and arranged in a band-like manner on the upper and lower jaws, and the teeth on both sides of the lower jaw are strong and sharp. The eyes are small, located on the upper side, located in the front half of the head, quite close to the tip of the snout. There are two pairs of nostrils, the anterior nostril is located at the end of the snout and is tubular, and the posterior nostril is located above the eyes and is a small round hole. The gill slits are large, the left and right gill membranes are healed, and they are not connected to the cheek. The gill rakers are thick, short, and sparsely arranged. There are two supragill organs with auxiliary functions on the left and right sides above the gill cavity.