Thunnus thynnus, commonly known as the Atlantic bluefin tuna, is a large fish species found in the Atlantic Ocean and the Mediterranean Sea. It is known for its streamlined body, which can reach lengths of up to 10 feet and weigh over 1,000 pounds. This species is highly migratory, traveling long distances between feeding and spawning grounds. The Atlantic bluefin tuna is a top predator in its ecosystem, primarily feeding on smaller fish like sardines and mackerel. Due to overfishing and high demand in the sushi market, its population has significantly declined, leading to conservation efforts aimed at protecting this iconic species.