Contact(s): Nathan Nye, DNR fisheries biologist, 608-635-8122; Laura Stremick-Thompson, DNR fisheries supervisor, 920-387-7876; Pete Jopke, Dane County Land and Water Resources Department water resources planner, 608-224-3733
MADISON - The Dane County Land and Water Resources Department, in cooperation with the Wisconsin Department of Natural Resources, is set to implement a common carp removal project and restore the fishery of Mud Lake in the Town of Roxbury in Dane County.
The project is tentatively scheduled for the week of Jan. 15, 2018, pending adequate weather conditions.
Consistent with recommendations made in the 2014 Fish, Crystal and Mud Lakes Management Plan, Mud Lake will receive a rotenone treatment to reduce common carp populations. Carp have negatively impacted the aquatic plant community, which has resulted in poor water quality conditions with common blue-green algae blooms.
Dane County Parks and Wisconsin Department of Natural Resources fisheries staff monitored Mud Lake for the past four years and plan to treat Mud Lake with PrenfishTM Fish Toxicant (5 percent rotenone active ingredient) at a concentration of 2.0 parts per million.
Prior to treatment, access points to Mud Lake will be posted with informational placards. Due to hydrological connection and seepage between Mud and Fish Lakes, a transitional area will also be posted on Fish Lake along Fish Lake Road. Placards will remain for 14 days post-treatment.
Recreational access (e.g., wading, swimming, boating, fishing, etc.) within the treatment area on Mud Lake is prohibited while rotenone is being applied. Do not swim or wade in treated water while placards are displayed. Fish should not be consumed from treated water in Mud Lake.
The rotenone will be injected under the ice and the application will take three days to complete. Rotenone is a botanical product that has a long history of proven effectiveness in rehabilitating shallow lakes. Given the cold water temperatures, the rotenone is expected to remain active for several weeks dependent on sunlight and temperature.