The Family Trichiuridae, commonly known as cutlassfish, is a group of marine fish that inhabit deep waters around the world. These fish are highly prized for their flavorful meat and are often harvested for commercial purposes. Some of the popular synonyms for the Family Trichiuridae include hairtails, scabbard fish, beltfish, and frostfish. Cutlassfish have a distinctive elongated shape and a sharp, bony projection on their upper jaw that they use for foraging. These fish are typically found in schools and are a favorite prey for larger predators like sharks, tuna, and swordfish. Overall, the Family Trichiuridae is an important element in the marine ecosystem and a valuable resource for human consumption.