Laboratory experiments are described in which the hearing of young lemon sharks was investigated using several conditioning methods. Hearing-threshold curves were obtained by approach, arousal, and escape conditioning, and are presented in absolute decibels and in decibels relative
to ambient noise. Limits of frequency discrimination are given which were based on experiments utilizing approach-avoidance and escape conditioning. Acoustic orientation in an approach-conditioned shark is described and mean orientation errors for several frequencies are given. Theories of
hearing in fish are reviewed and comparisons are drawn between present results and those of previous studies. The significance of these results is discussed in the light of present acoustical concepts, such as pressure and displacement, and the near and far fields.
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