Sometimes called bullet mackerel, the bullet tuna is a comparatively small and slender tuna.

The slender tuna, Allothunnus fallai, is a species of tuna, the only species in the genus Allothunnus, found around the world in the southern oceans between latitudes 20 and 50 South.

For example, the cladogram illustrates that the skipjack tunas are more closely related to the true tunas than are the slender tunas (the most primitive of the tunas), and that the next nearest relatives to the tunas are the bonitos of the Sardini tribe.