Geographic Distribution
Historically, the Shorthead Redhorse is native to North America. Its native range includes the Great Lakes, Hudson Bay, Mississippi River, and Lawrence River basins. They ranged across from Quebec to Alberta and as far south as northern Alabama and Oklahoma. Shorthead Redhorse also originally occupied the Atlantic Slope drainages, ranging from the Hudson River in New York to the Santee River in South Carolina. When the Tennessee Valley Authority started building dams in the 1930s in an attempt to create power, the dams blocked different fish such as striped bass, from moving upstream to their spawning ranges. While some fish ranges have decreased since the construction of the dams, the Shorthead Redhorse’s range has expanded. The Shorthead Redhorse is a “habitat generalist near the core of its range,” so it can tolerate disturbance better than other related redhorse species such as the River Redhorse, M. carinatum. Shorthead Redhorse can now be found in the tidal zones of the Hudson River. They are believed to have invaded the Hudson by way of the Mohawk River and have established themselves in the Hudson estuary. Other areas they have been found in include the Embarras River system in Illinois and the Red River below Lake Texoma dam in Grayson County, Texas.
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