This is a short video by SPC (filmed in October 2011) about a tagging campaign in the area between Tonga and Wallis and Futuna.
Tuna tagging involves the capture, tag and release of large numbers of tuna with numbered plastic dart tags, and the documentation (time, location, fishing method, fish size) of subsequent recaptures of these fish by the various types of fisheries across the region. Tagging is carried out mainly using the pole-and-line fishing method, in which fish are caught, tagged and released in a matter of seconds. Information is recorded on the fish’s species and size, along with the date and location of the tagging.
More on SPC Tunna tagging programme here