Thunnus tonggol

{{Short description|Species of tuna}}

{{Speciesbox

| name = Longtail tuna

| fossil_range =

| image = Thunnus tonggol.jpg

| image_caption =

| status = DD

| status_system = IUCN3.1

| status_ref = {{Cite journal | author = Collette, B. | author2 = Di Natale, A. | author3 = Fox, W. | author4 = Juan Jorda, M. | author5 = Miyabe, N. | author6 = Nelson, R. | author7 = Sun, C. | author8 = Uozumi, Y. | name-list-style = amp | title = Thunnus tonggol | journal = The IUCN Red List of Threatened Species | volume = 2011 | page = e.T170351A6763691 | publisher = IUCN | date = 2011 | url = http://www.iucnredlist.org/details/170351/0 | doi = 10.2305/IUCN.UK.2011-2.RLTS.T170351A6763691.en | access-date = 24 December 2017| doi-access = free }}

| parent = Thunnus (Neothunnus)

| taxon = Thunnus tonggol

| authority = (Bleeker, 1851)

| synonyms = *Thynnus tonggol Bleeker, 1851

• Kishinoella rara (Kishinouye, 1915)
• Kishinoella tonggol (Bleeker, 1851)
• Neothunnus tonggol (Bleeker, 1851)
• Neothunnus rarus (Kishinouye, 1915)
• Thunnus nicolsoni Whitley, 1936
• Thunnus rarus Kishinouye, 1915

| synonyms_ref = {{ITIS|id=172430|taxon=Thunnus tonggol}}

}}

Thunnus tonggol is a species of tuna of tropical Indo-West Pacific waters.

It is commonly known as the longtail tuna or northern bluefin tuna.Hutchins, B. & Swainston, R. (1986). Sea Fishes of Southern Australia. pp. 104 & 141. {{ISBN|1-86252-661-3}}Allen, G. (1999). Marine Fishes of Tropical Australia and South-East Asia. p. 230. {{ISBN|0-7309-8363-3}} The usage of the latter name, mainly in Australia to distinguish it from the southern bluefin tuna, leads to easy confusion with Thunnus thynnus of the Atlantic and Thunnus orientalis of the North Pacific. Compared to these "true" bluefins, Thunnus tonggol is more slender and has shorter pectoral fins.

Thunnus tonggol reaches {{convert|145|cm|in}} in length and {{convert|35.9|kg|lb}} in weight.{{FishBase| genus = Thunnus| species = tonggol| year = 2011 | month = December}} Compared to similar-sized tunas, its growth is slower and it lives longer, which may make it vulnerable to overfishing.