Summary
The auditory sensitivity in the European eel (Anguilla anguilla) was measured using an acoustic tube producing sound stimuli with different ratios between sound pressure and particle motion. The upper audible frequency limit in the eel was about 300 Hz. At low frequencies the relevant stimulus parameter was particle motion, excluding involvement of the swimbladder. At the higher frequencies within the audible range the swimbladder conveyed an auditory advantage for stimuli with a high ratio between pressure and particle motion. The eel has an extremely long distance between the swimbladder and the ear. An auditory function of the swimbladder in this species therefore indicates an efficient transmission channel for the reradiated swimbladder pulsations between the bladder and the ear, although specialized anatomical adaptations for this purpose are lacking.
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Jerkø, H., Turunen-Rise, I., Enger, P.S. et al. Hearing in the eel (Anguilla anguilla). J. Comp. Physiol. 165, 455–459 (1989). https://doi.org/10.1007/BF00611234
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DOI: https://doi.org/10.1007/BF00611234