Abstract
The Salton Sea, with a surface area of about 350 square miles, is the largest inland body of water in California. Ambient noise was measured once a month in this salt-water sea from January to August 1970 with a calibrated recording system. There was no seasonal change in daytime levels. However, the night-time spectrum level at 1000 Hz increased by about 50 dB from January to May. This great increase in level resulted entirely from a chorus of sounds produced by the orangemouth corvina (a croaker), Cynoscion xanthulus. The seasonal peak of sound production coincided with the breeding season (April–June) of the 1 to 2 million corvina. During the winter, the Sea was exceptionally quiet at all hours with a spectrum level over the entire recording band approaching the empirical lower limit for ocean noise. The 50-dB increase in sustained ambient noise level is the greatest ever noted from underwater natural causes.
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