AN EXPERIMENTAL STUDY ON THE EFFECT OF THE SWIMBLADDER ON HEARING SENSITIVITY IN AMEIURUS NEBULOSUS NEBULOSUS (LESUEUR)

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Abstract
Hearing sensitivity was observed in Ameiurus nebulosus nebulosus (LeSueur). A threshold curve over the frequency range from 210 to 1840 c.p.s. was established for normal fish as well as for fish in which the swimbladder had been mutilated. A comparison of both threshold curves indicates that the sensitivity in operated fish was decreased in the whole frequency range: for the frequencies from 330 to 750 c.p.s. by about 13 db; for the frequencies of 1000, 1300, and 1500 c.p.s. by respectively 23, 27, and 30 db. The stronger decrease at the higher frequencies was attributed to the loss or modification of the resonance of the opened swimbladder. The sensitivity of the operated fish increased in the frequency range from 330 to 210 c.p.s. This increase in sensitivity is abolished when the lateralis branch of the vagus is cut and must therefore be attributed to perception of low frequency vibrations by the lateral line.

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