Both sides of the head have a pair of well-developed cymbals around the mouth. It is often active in the upper and middle layers of the shallow sea, with a vertical range of over 100 meters. The body is long and slender with long cones. It feeds on krill, sardines, silver mullet, and small male fish. It is itself a prey for fierce fish. The eggs mature in batches and are produced in batches. The eggs are packaged in the glial egg sheaths. Each egg sheath covers several to several hundred eggs depending on the species. The egg production of different species varies greatly, ranging from several hundred. To tens of thousands. There are two pieces of eel in the eel body as a respiratory organ; the body is divided into a head, a very short neck Chinese calamari (commonly known as "carp"), the meat is delicate, the dried product is called "dried eel," and the meat is particularly good, both at home and abroad. The market is famous for its annual production of 4-50,000 tons, and the main fishery is in the Beibu Gulf of Hainan, southern Fujian, Taiwan, Guangdong, Hebei Bohai Bay and Guangxi offshore, as well as the Philippines, Vietnam and Thailand offshore, including the Beibu Gulf of South China Sea, Salmon from Bohai Bay is best.