The 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. Atlantic bluefin tuna are apex predators, primarily feeding on smaller fish such as sardines and mackerel. They are also known for their impressive speed, capable of swimming at speeds up to 43 miles per hour. Due to overfishing, their populations have declined significantly, leading to conservation efforts to protect this iconic species.