Makaira nigricans or the “Blue Marlin” is listed as a vulnerable species. The blue marlin is under intense pressure from long line fishing. In the Caribbean region alone, Japanese and Cuban fishermen annually take over a thousand tons. Sport fishermen have been at the forefront of efforts to conserve blue marlin populations. The initial efforts to develop electronic tags for tracking highly migratory fish were carried out on marlin in Hawaii, in collaboration with anglers in the Hawaiian International Bill fish Tournament