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Description:On 13 September 2000, two beluga whales were captured, tagged, and released in the Knik Arm of Cook Inlet, Alaska, by NMML scientists. The first beluga (referred to as Paul) was a 268 cm (8’ 11”) juvenile female; the second (referred to as Ringo) was a 413 cm (13’ 7”) adult male. Satellite tags, which provide location and dive data, were attached to the dorsal ridge of each whale (Figure 1: See below). The tags communicated with an ARGOS satellite when the antenna was exposed above the surface of the water, such as when the whale surfaced to breathe. In addition to the satellite tag, a time depth recorder (TDR) was attached to Paul via a suction cup (Figure 2: See below). The TDR recorded information on diving behavior every second for 55 hours. This instrument, however, remained on the whale for more than 90 hours.
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