AThe alligator gar, Atractosteus spatula, is a primitive ray-finned fish. Unlike other gars, the mature alligator gar possesses a dual row of large teeth in the upper jaw. Its name derives from the alligator-like appearance of these teeth along with the fish's elongated snout. The dorsal surface of the alligator gar is a brown or olive color, while the ventral surface tends to be lighter. Their scales are diamond-shaped and interlocking (ganoid) and are sometimes used by Native Americans for jewelry and arrow heads.Along with its status as the largest species of gar, the alligator gar is the largest exclusively freshwater fish found in North America, measuring 8 to 10 ft (2.4 to 3.0 m) and weighing at least 200 lb (91 kg) at maturity. The largest alligator gar caught by net was caught by Kenny Williams, fromVicksburg, Mississippi, in February 2011, and measured 8 ft 5 in (2.57 m) long, 327 lb (148 kg) in weight, and nearly 48 in (120 cm) around. The fish is believed to have been between 50 and 70 years old, wildlife officials said. Williams has donated the fish to the Mississippi Museum of Natural Science in Jackson where it will be on permanent display in the future. The fish is also known for its ability to survive outside the water, being able to last for up to two hours above the surface.