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Journal of Experimental Biology 96,367-376 (1982)
Published by Company of Biologists 1982

Auditory Acuity in the Sea Catfish (Arius Felis)

WILLIAM N. TAVOLGA ¹

¹ Mote Marine LaboratorySarasota, Florida

Frequency discrimination limens and signal-to-noise ratios were determined for the sea catfish, Arius fetis, using avoidance-conditioning techniques. The lowest frequency discrimination limens had values of about 2.5% at 100 Hz. Other determinations were 3.5 % at 200 Hz, and 5 % at 400 Hz, but these values were significantly greater if the test frequencies were higher than the reference. Signal-to-noise ratios were 14 dB at 100 Hz, 18 dB at 200 Hz, and 24 dB at 400 Hz, with reference to the spectrum level of broad-band noise. These findings, and previous measurements of acuity, are discussed in relation to echolocation in Arius, which is known to involve sounds in the 100–200 Hz range.

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