2. Catfish, also known as Huziyu and Tangyang, is characterized by scalless body, slimy body surface, flat head and wide mouth, and four beards on the upper and lower jaws, which are widely distributed and mainly produced in the Yangtze River and Pearl River basins, with the best eating season from mid-spring to mid-summer (April-July). Catfish is a carnivorous fish, its meat is tender and tender, delicious and rich in protein and fat, and it is nutritious, especially suitable for people with weak constitution and malnutrition.