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Simon Thorrold holding a PSAT tag.

Simon Thorrold holding a PSAT tag.
Simon Thorrold holding a PSAT tag.
Simon Thorrold holding a PSAT tag.
Simon Thorrold holding a PSAT tag.
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Kleindinst, Thomas N.
Simon Thorrold holding a PSAT tag.
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07/22/2013
graphics/S_Thorrold_P-SAT_Tag/_DSC3033.jpg
The tags are attached to the sharks in this case via an intramuscular dart and short tether. The tags record temperature, depth and light levels every 3-5 seconds. The two tags that look like little boats also have a GPS unit on them that can log a GPS position when they are on the surface for a couple of minutes. Then at a predetermined time the tag releases from the shark, floats to the surface and then begins to download a summary of data to the researcher via the ARGOS satellite system.
Image Of the Day caption:
To reveal the hidden lives of sharks, scientists like Simon Thorrold in the WHOI Fish Ecology Laboratory are using Pop-up Satellite Archival Transmitting tags. The tags attach to sharks, recording temperature, depth, and light levels every 3 to 5 seconds. After a programmed time, the tags release, float to the surface, and relay a summary of data logged by the tag via satellites. Thorrold will speak at a forum on sharks and seals tonight at 7 p.m., which will be Webcast. The public is also invited to explore educational displays and hands-on activities and talk to researchers 5:30 to 9 p.m., under the Discovery Tent behind Redfield Auditorium.
Photo by Tom Kleindinst
© Woods Hole Oceanographic Institution
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