I was watching Roland Martin (yes the bass fisherman) at lunch today on OLN and his show was on the research and tagging of bluefin tuna in the Atlantic. Stanford University and the Monterey Bay Aquarium have been doing this research and at the end of the show they talked about the same research going on in the Pacific.
Some interesting info on this site:
TOPP - Fish
The last article is pretty interesting.
Go to the home page and you can look at the live map tracking.