How does the Weberian apparatus improve hearing in ostariophysan fishes?

The Weberian apparatus is a specialized chain of four pairs of bones, known as ossicles, that connects the swim bladder to the inner ear in fishes of the superorder Ostariophysi.12

This system significantly enhances hearing by functioning similarly to a hydrophone. When underwater sound waves strike the fish, they cause the walls of the swim bladder to vibrate. The Weberian ossicles then capture these vibrations, increase their amplitude, and conduct them directly to the internal ears.31

This mechanism provides ostariophysans with a highly developed sense of hearing compared to other fishes, allowing them to detect a broad frequency range—typically between 16 and 7,000 hertz, with some species reaching up to 10,000 hertz. This acute sensitivity is vital for communication, reproduction, and maintaining species integrity, particularly in environments where visibility may be limited.3