Two biologists discovered the Maryland Darter in 1912, and it wasn't until fifty years
later that graduate students further recorded the species. In 1965, a healthy population
was found in portions of Deer Creek and Gasheys Run in Harford, Maryland. It is
thought to have been abundant in the lower Susquehanna River basin near Aberdeen and
Havre de Grace, however it is now limited to Deer Creek. The construction of the
Susquehanna River Dam greatly reduced the Maryland Darter's range, swallowing up
much of the fish's former habitat and causing extensive silting.
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