The Big Eye Tuna “Thunnus obesus” are generally smaller than the bluefin tuna and larger than the yellowfin. They are long and lithe, have a dark metallic blue on the back on the dorsal side, and are almost white on their ventral sides. They can live up to 10 to 12 years. It is a type of tuna that lives in the warm and temperate waters of the Atlantic, Pacific and Indian Oceans, rarely found in the Mediterranean. It is a pelagic species that moves from the surface to 250 m deep in the ocean. Males can reach 250 cm in total length and 210 kg in weight.