Longtail tuna are unique as they are one of the only species of tuna that are not highly migratory. Longtail tuna is distributed throughout subtropical and tropical waters from the Western Indian Ocean to the Western Pacific Ocean, between latitudes 47° N and 33° S.
Where do they go to breed?
Longtail tuna in the southern hemisphere mature at 50-60 cm FL and has a single long spawning period that extends between October and April.
In both hemispheres, longtail tuna produces between 768,000 and 1.9 million oocytes per spawning, which may occur daily if water temperatures remain between 24–28°C, being the optimal spawning temperature for most Thunnus species.