Thunnus maccoyii, commonly known as the Southern Bluefin Tuna, is a large species of tuna found primarily in the southern hemisphere. This fish is known for its streamlined body and powerful swimming abilities, reaching lengths of up to 3 meters (10 feet) and weights of over 400 kilograms (880 pounds). It is a highly migratory species, often traveling long distances in search of food. Southern Bluefin Tuna are carnivorous, primarily feeding on smaller fish and squid. They are commercially important and are sought after for their high-quality meat, especially in sushi and sashimi dishes. Due to overfishing, Thunnus maccoyii is considered endangered, leading to various conservation efforts to protect its populations.