Bluefin tuna feed primarily on other fish, including herring, anchovies, sardines and mackerel, according to the Office of Protected Resources. Young bluefin tuna also eat some crustaceans. The bluefin tuna is the largest of the tuna species, and it is an important large predator in the Atlantic Ocean.
Oceana states that bluefin tuna live mostly in the pelagic ecosystem of the North Atlantic Ocean. They're particularly common in the Mediterranean Sea and the Atlantic Ocean between Ecuador and Norway, and a second population is found in the Gulf of Mexico. Research shows that tuna are a highly migratory species. They migrate both to seek food and to spawn. Tuna born in the Gulf of Mexico return to this area to spawn each spring, and those born in the Mediterranean region return to this area in June or July to spawn.
The bluefin tuna grows slowly and has a long life, according to Oceana. Its average lifespan is estimated to be about 20 to 32 years. The Office of Protected Resources states that adults can reach lengths of up to 13 feet and weigh of up to 2,000 pounds, though the average weight of an adult bluefin tuna is 500 pounds and the average length is 6.5 feet.