Storms start to move out of Minnesota, continue for western Wisconsin

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Minnesota natural resources officials appear to have won a skirmish in their long, ongoing battle against invasive zebra mussels.


A three-step treatment to kill a pocket of mussels in Hennepin County's Christmas Lake has been effective on a "small, isolated infestation" that was detected early," the state 

Department of Natural Resources said Monday


An April 13 survey by divers found no evidence of zebra mussels.


"We are encouraged by these early results," Keegan Lund, DNR aquatic invasive species specialist, said in a statement. "We used every available tool to respond to this isolated zebra mussel infestation and learned valuable information in terms of responding to new infestations."

. It took a new approach, using a product called Zequanox, which is made from the dead cells of a naturally occurring microbe. 


The company that makes the product says that once ingested, it deteriorates a mussel's digestive lining, causing death without harming the rest of the ecosystem.

Besides Zequanox, the DNR used a copper treatment of EarthTec QZ in both October and November. A month later, a contractor working with the DNR injected 1,000 pounds of potash under the ice near the public boat access.


The copper and potash applications were "experimental off-label uses," the DNR said.


"Extensive in-lake monitoring will be required over a period of years to determine whether zebra mussels have been eliminated from the lake," the department added.


More than 175 Minnesota lakes and rivers are infested with zebra mussels, an invasive species that can push out native mussels. They can also cause more algae and weed growth — they filter the lake water, allowing sunlight to penetrate more deeply. They attach to boats, making it easy for them to travel and contaminate other waters.


In 2012, the DNR tried a copper sulfate treatment in lakes in Otter Tail and Douglas counties 

MPR News Staff

Author

An experimental treatment at Hennepin County's Christmas Lake appears to have killed a small, isolated zebra mussel infestation, officials said Monday.

Divers found no evidence of zebra mussels.

DNR wins a round in battle against zebra mussels

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