Carpiformes have Weber's apparatus whose function is to connect the front end of the swim bladder with the inner ear, which can transmit the pressure changes felt by the swim bladder to the inner ear and improve the sensitivity of hearing. The Weber's apparatus is a group of bone fragments with specific functions formed by the mutation of several vertebrae in the front of the carp, catfish and other fish, which are the latch bone, navicular bone, intercalary bone and triangular bone from front to back.

Weber's organ:

Weber's organ that is: four pairs of small bones on both sides of the 1st -3rd vertebrae of the bony fish Cypriniformes, from anterior to posterior, known as the strap bone, hublot bone, interposed bone, and triangular bone, which are called Weber's organ. The Weber's apparatus is formed by the mutation of some components of the anterior 1-3 vertebrae of the carpiformes and catiformes to form a group of Weber's apparatus with specific functional bone fragments. It is usually recognized that there are four pairs of Weber's ossicles, which are, from anterior to posterior, the latch bone, navicular bone, intercalary bone, and tricuspid bone.