In 2009, Minnesota treated Pickerel Lake with fish poison to remove common carp; water clarity rose nearly 600% and plant cover climbed from 4.6% to 90%

Pickerel Lake, Minnesota, has battled significant water quality and algal bloom problems for decades, primarily due to invasive common carp taking over the shallow waters. After their removal in 2009, the lake underwent a remarkable ecological revival, with water clarity significantly improving and native aquatic plants flourishing once more. This successful restoration highlights the pivotal role of addressing invasive species in revitalizing ecosystems.