| Longtail Tuna | |
|---|---|
 | |
| Information | |
| Common Name | Northern Bluefin Tuna |
| Range | Indo-West Pacific |
| Scientific Classification | |
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Actinopterygii |
| Order | Perciformes |
| Family | Scombridae |
| Genus | Thunnus |
| Species | T. tonggol |
| Conservation Status | |
 Data Deficient | |
The Longtail tuna, or Northern bluefin tuna, (Thunnus tonggol), is a species of tuna of tropical Indo-West Pacific waters. The usage of the latter name, mainly in Australia to distinguish it from the southern bluefin tuna, leads to easy confusion with the atlantic bluefin tuna of the Atlantic and the pacific bluefin tuna of the North Pacific. Compared to these "true" bluefins, Thunnus tonggol is more slender and has shorter pectoral fins.
The Longtail tuna reaches 145 centimetres (57 in) in length and 35.9 kilograms (79 lb) in weight. Compared to similar-sized tunas, its growth is slower and it lives longer, which may make it vulnerable to overfishing.