The U.S. Fish and Wildlife Service started treating the Winooski River Friday to control the population of sea lamprey.
The sea lamprey control team is using a chemical called TFM to kill the lamprey. They are applying it at the dam in Winooski, using the turbine to mix and spread the chemical into the water.
Fish and Wildlife says the ongoing treatment efforts are working and that the species is more contained than ever before.
"Basically we're looking at a maintenance situation. As the number of lamprey decline lakewide, we're going to keep conducting population assessments in all the tributaries and continue to treat the populations where it's warranted," said Steve Smith of the U.S. Fish & Wildlife Service.
Smith says because of the life cycle of the lamprey, this section of the river won't need to be treated again for another four years, and the chemical should dissipate from the river in 4-8 days.