What Divers Should Know About Thresher Shark

Instantly recognizable by their incredibly long, whip-like caudal fin, thresher sharks are truly unique predators of the open ocean. These large mackerel sharks primarily inhabit pelagic environments, though they can occasionally be sighted in shallower, inshore waters as they follow schooling prey. Common threshers are more prevalent in coastal waters over continental shelves, while bigeye and pelagic species are typically found in the warmer waters of the Central and Western Pacific.

When encountering them, you'll note thresher sharks are generally solitary creatures, though some species have been observed hunting in small groups of two or three. Their distinctive tail is a powerful tool, used to stun smaller schooling fish like mackerel and tuna before feeding. Thresher sharks typically prefer waters 550 meters (1,800 ft) and less, though they have been recorded at significantly greater depths. Despite being active predators, they pose no known threat to humans. All three species are highly migratory, often traversing vast ocean distances. These magnificent animals have been listed as vulnerable by the World Conservation Union (IUCN) since 2007.