Thunnus is a paraphyletic subgenus of ray-finned bony fishes in the Thunnini, or tuna, tribe. More specifically, Thunnus (Thunnus) is a subgenus of the genus Thunnus, also known as the "true tunas". Thunnus (Thunnus) is sometimes referred to as the bluefin group and comprises five species:
subgenus Thunnus (Thunnus) T. alalunga (Bonnaterre, 1788) – albacore T. maccoyii (Castelnau, 1872) – southern bluefin tuna T. obesus (Lowe, 1839) – bigeye tuna T. orientalis (Temminck and Schlegel, 1844) – Pacific bluefin tuna T. thynnus (Linnaeus, 1758) – Atlantic bluefin tuna
{| class="wikitable" |- ! style="background-color: #D7F0FF; color:black;" colspan="9"| Thunnus (Thunnus) – the bluefin group of tunas |- ! style="width:12em" | Common name ! style="width:12em" | Scientific name ! Maximumlength ! Commonlength ! Maximumweight ! Maximumage ! Trophiclevel ! Source ! style="width:13em" |IUCN status |- | Albacore | T. alalunga(Bonnaterre, 1788) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| 9–13 yrs | style="text-align:center;"| 4.31 | style="text-align:center;"| | Least Concern |- | Southern bluefin tuna | T. maccoyii(Castelnau, 1872) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| 20–40 yrs | style="text-align:center;"| 3.93 | style="text-align:center;"| | Endangered |- | Bigeye tuna | T. obesus(Lowe, 1839) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| 5–16 yrs | style="text-align:center;"| 4.49 | style="text-align:center;"| | Vulnerable |- | Pacific bluefin tuna | T. orientalis(Temminck & Schlegel, 1844) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| 15–26 yrs | style="text-align:center;"| 4.21 | style="text-align:center;"| | Near Threatened |- | Atlantic bluefin tuna | T. thynnus(Linnaeus, 1758) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| 35–50 yrs | style="text-align:center;"| 4.43 | style="text-align:center;"| | Least Concern
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