Abstract
Diving tests were conducted with a free swimming rough-tooth porpoise ( Steno bredanensis) off Pokai Bay, Oahu, Hawaii, in which the porpoise was trained to dive and depress a lever-actuated buzzer suspended from a calibrated cable. Fifty-one dives were made in 1 3 4 hr , the deepest to approximately 30 m. At this depth 18 sec were required from surface to receipt of the signal. The buzzer was thought to have attracted sharks, which frightened the animal away.
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