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Pure-tone sound detection thresholds were obtained in water for one harbor seal ͑Phoca vitulina͒, two California sea lions ͑Zalophus californianus͒, and one northern elephant seal ͑Mirounga angustirostris͒ before and immediately following exposure to octave-band noise. Additional thresholds were obtained following a 24-h recovery period. Test frequencies ranged from 100 Hz to 2000 Hz and octave-band exposure levels were approximately 60-75 dB SL ͑sensation level at center frequency͒. Eachdoi:10.1121/1.427122 pmid:10462817 fatcat:uwjhw63wvbdpzi6cnyd4qlwzg4