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Subject 1: (Interview). Subtitle: Barbara Block. Timecode In: 00:01:16. Timecode out: 00:16:22. Notes: Bluefin Tuna. Subject 2: (Interview). Subtitle: David Marcinek. Timecode In: 00:27:49. Timecode out: 00:33:33. Notes: Tracking Bluefin Tuna. Subject 3: (Interview). Subtitle: Heidi Dewar. Timecode In: 00:34:59. Timecode out: 00:47:44. Notes: Tracking Bluefin Tuna. Subject 4: (Interview). Subtitle: Dick Stone. Timecode In: 00:52:57. Timecode out: 01:23:44. Notes: Migratory fish; Fisheries science and politics. Equipment Notes: Stereo=1; Decoded MS stereo; Dual-Channel Mono. NPR/NGS RADIO EXPEDITIONS TUNA DAT 4 1:17 (some ambi before, but cj and Linda are talking in bg) CJ -how did you conceive of doing this rather strange thing with bluefin tuna? 1:21 BB -well, i think we have been on the path for doing now for quite a long time. i have studied where pelagic fish go using acoustics under the best scientists in our nation and have been ...1:39 we have been using techniques to study fish remotely through acoustics and now archival and now sat. tags for over 15 yrs and it is a tradition that has been passed on to me by my mentors and one that i believe that will help us understand what these animals do in what is a relatively difficult environment to study them in -the open ocean, far from shore where most of us have very little understanding of how things work CJ -diff tags -and what they say about the fish - BB -we use 3 diff kinds of tags in this project. acoustic tags which send us data via sound, give us high resolution but short term data. so we get where the fish is going in second by second bits of information, and it tells us a lot about the behavior of the animal, but for short periods -2 to 5 days. archival tags are taking data every 2 minutes so the tags sleeps it then wakes up sample the en ....AGAIN: archival tags are taking data every 2 mins and what they do is they have a microprocessor that is in a sleep state it wakes up samples 4 variables [cj -which are] temperature of the body, temperature of the ambient environment, light and pressure. it then goes back to sleep and we are then able to construct a plot of these 2 variables that give us relatively highly accurate information over the day and night time period. what's is great about archival tags is that we get long term data, data that for up ......AGAIN: 3:31 archival tags take data every 2 mins from 4 sensors: light, pressure or depth, ambient temp. and body temp. and from those every 2 min samplings the microprocessors wakes up and does we are able to reconstruct daily what the fish is doing during the daytime and nighttime and also get a light plot that allows us to calculate geolocation of the fish on earth. 3:58 CJ -you can tell where the fish is bc of -describe how that works - 4:03 BB-similar to the techniques used by ancient mariners, and mariners today, we can calculate a local noon from sunrise and sunset data and AGAIN: 4:16 similar to ancient mariners that were able to locate by using the local apparent noon, what the fish is doing is measuring light every 2 mins and gives us a sunrise, a plateau of light everyday and a sunset event and from that data we are able to calculate a midpoint which is local noon for the fish and it has a very accurate clock in the microprocessor that's in the tag and we can use the clock time and the local noon to calculate longitude -where we are in relation to Greenwich. Latitude we get by knowing the day length, so when the sun came up and when the sun came down. and what makes this tricky is that this is al in a fish that is moving up and down rapidly from the surface down to about 700 feet down in the water column. 4:58 CJ could you do anything like this kind of research w/o these tags? 5:03 BB-no i think it has been a mystery up until now where do these animals go. the open ocea... (Notes truncated)
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- 11 Aug 2009 - Ben Brotman
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- 11 Aug 2009 - Ben Brotman
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- 11 Aug 2009 - Ben Brotman