Abstract
Many types of auditory systems are found in the more than 20<th>000 different species of teleost fish. These unique sensors may detect extremely small acoustic particle velocities as well as acoustic pressure. Auditory bandwidths may range from very low frequencies to ultrasonic regimes depending on the species. Several experimental studies conducted over the last 15 years have yielded data which indicate that auditory sensitivity, bandwidth, and source localization are primarily controlled by the biomechanics of the periphery. In these studies in vivo displacements of peripheral auditory organs were measured noninvasively in response to tones emitted from an underwater speaker. The measurements were then correlated with mathematical models formulated from the basic physics of each system. Results are presented for three different species, goldfish (Carassius auratus), oscars (Astronotus ocellatus), and shad (Alosa sapidissima), and compared with auditory capabilities determined in behavioral and physiological studies reported in the literature.
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