The bluefin itself has two subspecies, the Pacific bluefin (T. thynnus orientalis) and the Atlantic bluefin (T. thynnus thynnus), whose populations are geographically isolated from each other.
其中黑鮪魚因為受地理限制，遺傳上相互分隔，又被分成太平洋黑鮪與大西洋黑鮪兩個亞種。