Atlantic bluefin and Pacific bluefin only recently came to be viewed by marine scientists as separate species.
Although it is generally smaller than Atlantic bluefin, Pacific bluefin is also one of the largest of the tuna species, ranging between 80–200 cm in length. It has the largest geographic range of all tunas, widely distributed throughout the North Pacific Ocean — from East Asia to the North American West Coast — and with a more limited presence in the Southern Hemisphere.
Thunnus orientalis is a temperate tuna species that can also range into tropical waters. It is considered to consist of only one stock and it forms schools by size, sometimes with other tuna and mackerel species.
|Size (cm)||Weight (kg)||Age (yrs)|
Given Pacific bluefin’s wide geographic range, the species is managed by two different Regional Fisheries Management Organizations:
Our Status of the Stocks report summarizes the status of bluefin tuna worldwide according to the most recent scientific assessments. The report includes:
It also reviews the management measures for bluefin that Regional Fisheries Management Organizations (RFMOs) have adopted.
Use our “Interactive Stock Status and Catch Tool” to visualize, download, and share data about bluefin tuna:
Our research and advocacy work aims to ensure, on a global level, that tuna resources are well managed and protected from overfishing.
An ISSF report uses the Marine Stewardship Council (MSC) scoring system to evaluate both the health and RFMO management of 23 tuna stocks worldwide, including bluefin.