Pacific bluefin tuna

The Pacific bluefin tuna (Thunnus orientalis) is a predatory species of tuna found widely in the northern Pacific Ocean, but it is migratory and also recorded as a visitor to the south Pacific.

In the past it was often included in T. thynnus, the 'combined' species then known as the northern bluefin tuna (when treated as separate, T. thynnus is called the Atlantic bluefin tuna). It may reach as much as 3 m (9.8 ft) in length and 450 kg (990 lb) in weight.

Like the closely related Atlantic bluefin and southern bluefin, the Pacific bluefin is a commercially valuable species and several thousand tonnes are caught each year. It was considered overfished and subject to overfishing for decades, but catches were reduced in 2011 in order to rebuild the stock and a 2024 stock assessment determined that the species had rebuilt and was no longer overfished nor subject to overfishing. It is now considered a management success. Monterey Bay Aquarium's Seafood Watch program lists Pacific bluefin tuna as a "Good alternative".