The yellowfin tuna (Thunnus albacares) is a species of bony fish in the mackerel family Scombridae, and is one of the larger tunas. At its largest, it grows nearly eight feet long, and routinely reaches weights of over four hundred pounds. Like all tunas, its body weight consists mostly of muscle. This species lives in tropical and subtropical seas around the world, preferring the pelagic zone. As of 2021, it is ranked Least Concern by the International Union for Conservation of Nature, meaning that it is not considered under threat of extinction. Still, it is heavily fished and eaten.