Fishing for Bluefin tuna, which can weigh up to 600 pounds, is growing in popularity. One fish can sell for over $50,000, and in 1997, anglers spent over $3.6 million in Hatteras on such items as accommodations, food, and fishing supplies. Since 1996, anglers and researchers have participated in a Tag-a-Giant Bluefin Project. The tuna is caught, tagged with an archival tag, and released. The tag transmits data to a satellite about movement, diving activity, depth, light, and external temperatures.