Bluefin tunas have a large, torpedo-shaped body that is nearly circular in cross-section. The fish is dark blue-black on the back and white on the lower sides and belly. On live bluefin, colorless lines alternate with rows of colorless spots on the lower sides. The second dorsal fin is reddish brown.
Bluefin tuna are most commonly found in deep offshore waters.
1,152 pounds, Ron Roland, 2003.
Yellowfin and blackfin tuna are more popular, but bluefin tuna can be caught if you find the right school moving through.