Six Mile Creek Carp Assessment
The Six Mile Creek Carp Assessment is underway in the chain of lakes west of Lake Minnetonka. The multi-year assessment is the first step toward sustainably managing common carp in this area. 

Researchers are currently electrofishing (temporary, non-harmful stunning of fish) to estimate carp populations. In August and September they will begin netting and tagging young carp, and later in the fall they will be implanting trackers in some carp. 

Common carp are bottom feeding invasive fish that create major problems for lakes by stirring up the lake bottom and removing vegetation while feeding, creating murky water and upsetting the delicate balance of lakes. The invasive fish are very likely a key cause of poor water quality in the Six Mile chain of lakes.

The MCWD and University of Minnesota are working to understand the abundance, movement and reproductive patterns of carp in this chain. Because carp live for 70 years or more, and spawn millions of eggs per year, just removing the fish is only a short-term solution. The assessment will help the District develop a plan to sustainably reduce carp populations throughout the Six Mile chain of lakes. 

If you catch a carp with a tag or radio transmitter, please release it back into the lake. If it is dead, please immediately notify the research team at or (952) 471-7873. Learn more at

Inspectors keep zebra mussels from Lake Harriet
So far in 2014, inspectors have stopped three boats carrying zebra mussels from entering Minneapolis lakes, including two from entering Lake Harriet in June, according to a report from the Minneapolis Park and Recreation Board (MPRB). 
On June 8, an inspector found zebra mussels on a plastic bait container in the boat's livewell. The boat had been on Lake Minnetonka the day prior. On June 13, a sailboat that had spent the previous year in Lake Pepin attempted to launch with hundreds of zebra mussels on the hull. 
The MPRB staffs three boat launches with AIS inspectors daily from 6 a.m. to 10 p.m. They are among several inspection sites across the District that the MCWD helps fund. Kudos to the inspectors for working diligently to keep harmful invasive species out of our lakes! 

Zequanox treatment approved for open water use
The U.S. EPA has approved Zequanox, a non-chemical treatment for killing zebra mussels, for use in open water. It has been in use in closed systems such as power plants since 2012. 

The MCWD is assisting the U.S. Geological Survey in studying the effectiveness of Zequanox in Lake Minnetonka. The study will determine how to best maximize the effectiveness of Zequanox and minimize the quantity and cost of application in lake environments. Zequanox will be applied in enclosed areas of Robinson's Bay this fall. 

MN DNR: "Too many boaters not following aquatic invasive species laws"
So far this season, watercraft inspectors around the state have found more than 1,300 boaters at public water accesses with aquatic plants, invasive animals or water in or on their boats and equipment, according to the Minnesota Department of Natural Resources. 

“Far too many people are still not following the law,” said Greg Salo, DNR central region enforcement manager, in a news release. "Some of these laws have been on the books for more than 15 years and yet we’re still seeing a 26 percent violation rate at enforcement check stations. That's unacceptable. Violators should know better by now.”

Read the full release here.

Understanding what's here
The MCWD is beginning an inventory of the AIS present throughout the District. Monitoring efforts including snorkeling, kayaking and taking water samples are underway to determine the presence of AIS, as well as detect any unknown infestations early. 

The MCWD will complete inventories of 23 heavily-used lakes this year, and continue to catalog more in future years. The monitoring efforts are designed to find both adult and very young species. 

Disposing of AIS that washes ashore
The high water we’ve had this year means more debris washing up on shore, which for some lakes and streams will include aquatic invasive species like zebra mussels or Eurasian watermilfoil. Please be careful in disposing of these harmful plants and animals to make sure you don't spread them elsewhere. Options for disposal:
  • Compost. The heat generated by the composting process kills zebra mussels and will break down milfoil and other aquatic plants
  • Take to a yard waste facility. Transporting AIS requires a permit from the Minnesota Department of Natural Resources. You can apply online.
  • Toss in the trash. Contact your garbage hauler and ask if they are permitted to transport aquatic invasive species in Minnesota

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