DANE COUNTY (WKOW) — The water quality in a popular lake northwest of Madison has become so bad the state and county have resorted to some high flying tactics to fix it.
The common carp has taken over Indian Lake. Wisconsin Department of Natural Resources fisheries biologist Dan Oele says the bottom-feeding fish, which is an invasive species here, has upset the local ecosystem so much so that toxic blue-green algae blooms have forced officials to close the lake to visitors.
“This summer was almost a consistent day after day blue-green bloom in this lake and it’s a very popular lake, especially with dog walkers,” Oele said.
Thursday, a helicopter sprayed a naturally-derived chemical into the water. Oele says the substance prevents the fish from absorbing oxygen via its gills. To prepare, Oele says staff used a large pump to lower the water level in the lake to concentrate the carp into one area.
The DNR plans to re-stock the lake with native fish species following the carp removal process with the goal of returning the ecosystem to normal within two to three years.