Bluefin tuna is a common name used to refer to several species of tuna of the genus Thunnus.
T. thynnus, Atlantic bluefin tuna, found in both the western and eastern Atlantic Ocean, and also in the Mediterranean Sea. Formerly known as northern bluefin tuna.
T. tonggol, Longtail tuna, found in tropical Indo-West Pacific waters. Known as the northern bluefin tuna in Australia,as it is found off their northern coast.
T. orientalis, Pacific bluefin tuna, found widely in the northern Pacific Ocean and locally in the south. Formerly known as northern bluefin tuna.
T. maccoyii, Southern bluefin tuna, found in open southern hemisphere waters of all the world's oceans.