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I was curious about it, found this article, and was thoroughly entertained! They can regenerate scilia and receptors! https://www.geoexpro.com/articles/2011/03/marine-seismic-sources-part-viii-fish-hear-a-great-deal Here’s a quote: ”Fish do not need an outer or middle ear, since the role of these structures in terrestrial vertebrates is to funnel sound to the ear and overcome the impedance difference between air and the fluids of the inner ear. Since fish live in water, and have the same density as water, there is no impedance difference to overcome. Fish do have an inner ear which is similar in structure and function to the inner ear of terrestrial vertebrates. The most important similarity between ears of all vertebrates is that sound is converted from mechanical to electrical signals by the sensory hair cells that are common in all vertebrates. Extreme high intensity sounds are able to fatigue or damage these cells, resulting in temporary or permanent hearing loss. However, fish continue to add sensory hair cells throughout their lives. In addition, there is evidence that fishes can repair sensory cells that have been fatigued due to sound exposures that cause a shift in auditory thresholds.”