Alopiidae

Alopiidae is a family of lamniform fishes commonly known as thresher sharks. This family contains a single extant genus, Alopias, which comprises three recognized species: the common thresher (Alopias vulpinus), the pelagic thresher (Alopias pelagicus), and the bigeye thresher (Alopias superciliosus). These sharks are characterized by their remarkably long, scythe-like upper tail fin (caudal fin), which can be as long as the rest of their body. This distinctive tail is used to herd and stun prey, which typically consists of small schooling fish and squid.

Thresher sharks are found in temperate and tropical waters worldwide, inhabiting both coastal and oceanic environments. They are generally solitary and elusive, making them difficult to study. Their coloration varies, with most species having dark grey, brown, or purplish backs and lighter undersides. They possess a streamlined body shape adapted for fast swimming. While generally not considered a threat to humans, encounters are rare due to their shy nature. All three species are listed as vulnerable or endangered by the IUCN, facing threats from overfishing, bycatch in fisheries, and habitat degradation. Conservation efforts are crucial for the long-term survival of these unique sharks.