Act! Join Us Support Our Efforts
Ocean Conservation Marine Life Species Database Education+Careers Projects Contributors Photos Videos News Connect
pinterest

Longtail Tuna, Thunnus tonggol


Longtail TunaContribute Photos or VideoContribute Photos or Video

Description & Behavior

Longtail tuna, Thunnus tonggol (Bleeker, 1851), aka blue fin tuna, bonitos, Indian long-tailed tunas, northern bluefin, northern bluefin tuna, oriental bonitos, and tuna, are in the Family Scombridae which includes the albacores, bonitos, mackerels, and tunas.

Longtail tunas are dark blue to black dorsally (on top), with silvery white bellies and lower sides. Colorless oval spots are arranged horizontally along their bellies. Their second dorsal and anal fins have yellow hues, while their caudal (tail) fins are blackish with yellow-green streaks. Their second dorsal fins are higher than their first, and their pectoral fins are short to moderately long in size. Max size and weight recorded is 145 cm and 35.9 kg respectively, while their common length is about 70 cm.

Longtail tunas seem to avoid turbid waters, and form schools of varying sizes.

World Range & Habitat

The tropical neritic zone (the shallow part of the sea along the coast, above the continental shelf) is what longtail tunas call home. They avoid turbid areas, as well as areas with decreased salinity, such as estuaries. Their range of the Indo-West Pacific includes the Red Sea and East Africa to New Guinea, south to Australia, and north to Japan.

Feeding Behavior (Ecology)

Longtail tunas feed on a variety of fishes, cephalopods, and crustaceans. They seem to particularly like stomatopod larvae and prawns.

Life History

Little is known about the reproduction of longtail tunas.

Conservation Status & Comments

Longtail tunas are a highly commercially harvested species for food. The IUCN has not evaluated their conservation status, but the collapse of the populations of other tuna species due to overfishing gives cause for concern. They are a moderate to highly vulnerable species.

Resilience to fishing pressure: Medium, minimum population doubling time 1.4 - 4.4 years
Extinction vulnerability to fishing: Moderate to high vulnerability (47 of 100)

References & Further Research

FAO Species Catalogue. Vol. 2. Scombrids of the world. An annotated and illustrated catalogue of Tunas, Mackerels, Bonitos and related species known to date.Collette, B.B. & C.E. Nauen 1983.. FAO Fish. Synop., (125) Vol.2:137 p.

Research Thunnus tonggol » Barcode of Life ~ BioOne ~ Biodiversity Heritage Library ~ CITES ~ Cornell Macaulay Library [audio / video] ~ Encyclopedia of Life (EOL) ~ ESA Online Journals ~ FishBase ~ Florida Museum of Natural History Ichthyology Department ~ GBIF ~ Google Scholar ~ ITIS ~ IUCN RedList (Threatened Status) ~ Marine Species Identification Portal ~ NCBI (PubMed, GenBank, etc.) ~ Ocean Biogeographic Information System ~ PLOS ~ SIRIS ~ Tree of Life Web Project ~ UNEP-WCMC Species Database ~ WoRMS

Search for Longtail Tuna » ARKive ~ Ask.com ~ Bing ~ dmoz ~ Flickr ~ Google ~ NatureFootage ~ Picsearch ~ Wikipedia ~ Yahoo! Images ~ YouTube

Feedback & Citation

Start or join a discussion about this species below or send us an email to report any errors or submit suggestions for this page. We greatly appreciate all feedback!


~^~ surface

Help Protect and Restore Ocean Life

Help us protect and restore marine life by supporting our various online community-centered marine conservation projects that are effectively sharing the wonders of the ocean with millions each year around the world, raising a balanced awareness of the increasingly troubling and often very complex marine conservation issues that affect marine life and ourselves directly, providing support to marine conservation groups on the frontlines that are making real differences today, and the scientists, teachers and students involved in the marine life sciences.

Join us today or show your support with a monthly donation.

With your support, most marine life and their ocean habitats can be protected, if not restored to their former natural levels of biodiversity. We sincerely thank our thousands of members, donors and sponsors, who have decided to get involved and support the MarineBio Conservation Society.