A short and stout bodied species with a large head. Its back is blackish blue, the sides are lighter and the belly is silver. The small ones have transverse stripes that disappear when they become adult.
Tuna is a migratory fish and a great swimmer. It feeds on sardines, anchovies, and other pelagic fish, including some crustaceans.
Its first spawning season begins from the third year of life, when it weighs between 15 and 20 kg, and can live for approximately 14 years.
Its length can range between 2 and 3 m, and weigh about 500 kg.