6. SOUND PRODUCTION AND DETECTION
159
6
2 4
2
0.2
0.4
0.6
sec
Fig. 13. Spectrogram of a burst of eight sound pulses produced by a squirrelfish, Holocentrus. The fundamental frequency within each pulse is about 75-100 Hz.
After Tavolga (1965), with permission of the U. S. Naval Training Device Center.
frequencies. The yelps of the gaff-topsail catfish range over 250 Hz
(Tavolga, 1962), and the calls of toadfish may reach above 300 Hz
( Tavolga, 1958~).
Some figures on the duration of swim bladder sounds in various species
0.6
3 0 4
0 2
0.2
0.4
0.6
sec
Fig. 14. Spectrogram of two gruntlike sounds produced by a marine catfish,
Galeichthys. These are short pulses with a fundamental frequency of about 200 Hz.
After Tavolga (1965), with permission of the U. S. Naval Training Device Center.