Zebra mussel confirmed in East Battle Lake in Otter Tail County

September 9, 2019

Connected West Battle Lake has had zebra mussels for at least 2 years

The Minnesota Department of Natural Resources has confirmed a zebra mussel in East Battle Lake in Otter Tail County. 

A lake property owner removing equipment from the lake for the season contacted the DNR after finding an adult zebra mussel attached to a dock post. DNR divers did not find any additional zebra mussels after searching 20 other pieces of equipment that had been removed from the lake and 350 objects in four areas of the lake.

As with any such confirmation of a specimen, East Battle Lake is listed for zebra mussels, and invasive species signage has been posted at accesses. The DNR will continue to monitor East Battle Lake for zebra mussels and other aquatic invasive species.

East Battle Lake is connected to, but upstream from, West Battle Lake, where zebra mussels were confirmed in August 2016. Several other lakes connected to West Battle Lake were added to the list of Minnesota waterbodies with zebra mussels in September 2018. They include Molly Stark, Annie Battle, Blanche, an unnamed lake and other connected portions from West Battle Lake to Otter Tail Lake. Zebra Mussels were confirmed in Otter Tail Lake in August 2016.

Lake property owners should carefully check boats and trailers, docks and lifts, and all other water-related equipment for invasive species when removing equipment for seasonal storage.

It is especially important to follow Minnesota’s law and keep docks and boat lifts out of the water for at least 21 days before putting them into another body of water. This state law is central to the training DNR-permitted lake service provider businesses receive.

Anyone transporting a dock or lift from a shoreline property to another location for storage or repair may need a permit. This permit requirement helps ensure appropriate steps are taken to  prevent the spread of aquatic invasive species.

The DNR recommends these steps for lake property owners:

  • Look on the posts, wheels and underwater support bars of docks and lifts, as well as any parts of boats, pontoons and rafts that may have been submerged in water for an extended period.
  • Hire DNR-permitted lake service provider businesses to install or remove boats, docks, lifts and other water-related equipment. These businesses have attended training on Minnesota’s aquatic invasive species laws and many have experience identifying and removing invasive species.

People should contact an area DNR aquatic invasive species specialist if they think they have found zebra mussels or any other invasive species.

Whether or not a lake is listed as infested, Minnesota law requires boaters and anglers to:

  • Clean watercraft and trailers of aquatic plants and prohibited invasive species,
  • Drain all water by removing drain plugs and keeping them out during transport, and
  • Dispose of unwanted bait in the trash.

Some invasive species are small and difficult to see at the access. To remove or kill them, take one or more of the following precautions before moving watercraft and trailers to another waterbody:

  • Spray with high-pressure water.
  • Rinse with very hot water (120 degrees for at least two minutes or 140 degrees for at least 10 seconds).
  • Dry for at least five days.

Zebra mussels can compete with native species for food and habitat, cut the feet of swimmers, reduce the performance of boat motors, and cause expensive damage to water intake pipes.

More information is available at mndnr.gov/ais.