Trichiurus lepturus, also known as the largehead hairtail, is a species of cutlassfish found circumglobally in subtropical waters. It can reach up to 234 cm in length and 5 kg in weight. T. lepturus is a benthopelagic fish found from the surface to depths of 589 m, usually between 100-350 m. It is a commercial species marketed fresh, dried, salted, or frozen.