Over time, alligator gar were afforded some protection by state and federal resource agencies. They are also protected under the Lacey Act, which makes transporting certain species of fish in interstate commerce illegal when in violation of state law or regulation. Several state and federal resource agencies are monitoring populations in the wild, and have initiated outreach programs to educate the public. Alligator gar are being cultured in ponds, pools, raceways, and tanks by federal hatcheries for mitigation stocking, by universities for research purposes, and in Mexico for consumption. Anatomy Alligator gar are the largest species in the gar family, and among the largest freshwater fishes found in North America. Mature alligator gar commonly measure in length, and weigh over 100 lb (45 kg). However, anecdotal reports suggest they can grow up to 10 ft (3 m) in length, and weigh as much as 350 lb (159 kg). The largest alligator gar officially recorded was inadvertently caught in the net of fisherman Kenny Williams of Vicksburg, Mississippi, while he was fishing the oxbow lakes of the Mississippi River on February 14, 2011. Williams was pulling up his net on Lake Chotard, expecting to find buffalo fish, but instead discovered a large alligator gar tangled in his net. The gar was long, weighed , and its girth was . According to wildlife officials, the fish was estimated to be between 50 and 70 years old; one report estimated the gar's age to be at least 95. Williams donated it to the Mississippi Museum of Natural Science in Jackson, where it will remain on display. All gars have torpedo-shaped bodies, but some distinguishing characteristics of adult alligator gar include their large size; heavy bodies; broad heads; short, broad snouts; large, sharp teeth; and double row of teeth on their upper jaws. They are usually brown or olive fading to a lighter gray or yellow ventral surface. The dorsal and anal fins are positioned toward the back of their bodies, and their caudal fins are abbreviate heterocercal, or nonsymmetrical. Physiology Alligator gar have gills, but unlike other species of fish, with few exceptions, they also have a highly vascularized swim bladder lung that supplements gill respiration. The bladder not only provides buoyancy, but also enables them to breathe in air, which is why they are able to inhabit bodies of water in which most other fishes would die of suffocation. The swim bladder