鱼鳔是由位于鱼消化道和肾脏 之间的一个突出的小囊长大而成。它由结缔组织和弹性纤维组成，富于胶质，表面光滑而有光泽，仅靠一条细长的鳔管和消化道相连接。鳔内充满了气体，通常为氮、氧和二氧化碳的混合气。不过淡水鱼是以氮气为主，而咸水鱼则以氧气为主。 鱼的种类繁多 The mandarin fish is made up of a prominent sachet located between the digestive tract of the fish and the kidneys. It consists of connective tissue and elastic fibers, rich in glial, smooth and shiny surface, relying on a slender tube and digestive tract connected.鳔 filled with gas, usually nitrogen, oxygen and carbon dioxide mixture. However, freshwater fish are mainly nitrogen, while saltwater fish are mainly oxygen. A wide variety of fish