Eurasian watermilfoil (Myriophyllum spicatum)
https://www.dnr.state.mn.us/invasives/aquaticplants/milfoil/index.html

Eurasian watermilfoil. Photo: Megan M. Weber (https://extension.umn.edu/identify-invasive-species/eurasian-watermilfoil)
https://www.dnr.state.mn.us/invasives/aquaticplants/milfoil/index.html