Bluefin and albacore are two species of tuna, both of which are popularly consumed around the world. Bluefin tuna is a large species of tuna that can grow up to 8 feet in length and weigh up to 1, 500 pounds. Albacore tuna is a smaller species of tuna that typically grows up to 4 feet in length and weighs up to 60 pounds. Both species are highly sought after for their flavor and texture, and are commonly used in sushi dishes.