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Journal of Experimental Biology 61,521-528 (1974)
Published by Company of Biologists 1974

Some Auditory Discrimination Experiments on Marine Fish

C. J. CHAPMAN ¹ and A. D. F. JOHNSTONE ¹

¹ Marine Laboratory, P.O. Box 101, Aberdeen, Scotland

The ability of cod, Gadus morhua (L.), and haddock, Melanogrammus aeglefinus (L.), to discriminate changes in sound direction and amplitude was studied using a cardiac conditioning technique. In one experiment it was found that the masking effect of noise transmitted from one sound projector on the ability of the fish to detect a tone (60-380 Hz) transmitted from another projector was reduced by 7 dB when the angle between the projectors was 45° or greater. It was also shown that the fish could be conditioned to a change in the direction of a pulsed tone switched between two projectors. The fish were able to discriminate changes in sound amplitude of 1.3-9.5 dB at frequencies between 50 and 380 Hz. The results are discussed in relation to sound localization in fish.