The yellow fin tuna’s back is gray blue, its belly is silvery with yellow fins. It is the most used tuna in the canning industry because of its tasty flesh. This type of tuna is caught during the whole year in equatorial and tropical waters.
Like all tuna fishes, the yellow fin tuna has a stocky and muscular body and a hydrodynamic figure. It differs from other tuna fishes by the yellow edge of its second dorsal and anal fins. Moreover, these two fins are very long. The dorsal and ventral pinnules are also yellow, the belly and side are bright. Eyes are large and the narrow caudal fin bears a perfectly homocercal fin.

The tuna is a pelagic fish living in small-size shoals which can be met from the surface to the depth ( up to 250 metres). It is active days and nights and lives in shoals including fishes having the same size. Sometimes, other tuna species or even dolphins catch up with these shoals. Large-size specimens live alone. The Yellow fin tuna is a species which carries out variable range migrations.

The yellow fin tuna is a fish- eater which lives on various medium-size pelagic species. Occasionally, it captures cephalopoda or crustaceans