The Atlantic Bluefin tuna is one of the fastest fish in the ocean reaching speeds in excess of 30 knots or 40 mph. The largest specimens can reach well over 10 feet in length and push 2000lbs but most tuna average 500lbs. The Bluefin is also the largest member of the mackerel family.Prized by chefs, sportsmen, and commercial fishermen worldwide, the bluefin tuna is truly a legendary fish.