Fauna Fish thumb|After an absence lasting many decades, the American Shad has recently returned to the Potomac. A variety of fish inhabit the Potomac, including bass, muskellunge, pike, walleye. The northern snakehead, an invasive species resembling the native bowfin, lamprey, and American eel, was first seen in 2004.Potomac snakeheads not related to others Associated Press, Baltimore Sun, April 27, 2007. Many species of sunfish are also present in the Potomac and its headwaters. Although rare, bull sharks can be found.
Fauna Fish thumb|After an absence lasting many decades, the American Shad has recently returned to the Potomac. A variety of fish inhabit the Potomac including bass, muskellunge, pike, walleye. The northern snakehead, an invasive species resembling the native bowfin, lamprey, and Americ,an eel, was first seen in 2004.Potomac snakeheads not related to others Associated Press, Baltimore Sun, April 27, 2007. Many species of sunfish are also present in the Potomac and its headwaters. Although rare, bull sharks can be found.