Skip to main content

DNR suspects too much oxygen caused fishkill in Lake Owasso

  • Author:
  • Updated:
    Original:

The Minnesota Department of Natural Resources suspects hundreds, perhaps thousands, of fish that died in Lake Owasso last week may have been killed by excessive oxygen in the lake.

DNR fisheries specialist Donn Schrader tells the Star Tribune newly formed ice likely trapped excess oxygen in the lake, acknowledging "It's kind of a freaky thing."

Residents reported the dead fish turned up under the ice last week.

Lake Owasso is in northern Ramsey County and is among the most popular fishing lakes in the Twin Cities area. The DNR told the Associated Press Monday most of the dead fish it counted were small panfish. But residents also showed the Pioneer Press trophy-sized walleye and muskies up to four feet long.

A DNR official told FOX 9 the agency ruled out herbicides as the cause of the die off, saying it does not treat the lake for weeds.

Harlan Hiemstra, a spokesman for the agency, tells the AP "We're not too alarmed by it. It's part of a natural process." But longtime residents and anglers speaking to both the AP and the Pioneer Press say they've never seen a fish kill on Lake Owasso at the beginning of winter, and never one of this size.

Large numbers of dead fish more commonly turn up on Minnesota lakes during ice out, when fish that were victims of the oxygen depletion known as"winterkill" emerge.

Next Up

Hutch crash booking photo

Walz, Flanagan call on Hennepin Co. sheriff to resign

"I would say that it is time for him to resign," the Lt. Gov. said.

line 3 enbridge portage lake hubbard county mn tony webster flickr

Months after missing deadline, Enbridge says Line 3 aquifer breach is fixed

The company told Bring Me The News it "successfully stopped the flow of groundwater" at the site.

canada bodies found

Baby, teenager among 4 found dead along MN, Canada border

Authorities believe all four froze to death.

unsplash roller rink skates CROP

Former roller rink, tennis courts will become new sports hub

The Wooddale Fun Zone has been closed since spring of 2020.

hibachi daruma

Popular hibachi food truck opens second Twin Cities restaurant

The much-anticipated Daruma opens for takeout Thursday evening.

20211128_Vikings_49ers_REG12_0144 (1)

What changes are coming to the Vikings' offensive line?

Once again, Minnesota has work to do to figure out its interior spots

Kris Ehresmann

One of Minnesota's key COVID-19 leaders is retiring

Kris Ehresmann has given more than 30 years of her life to public health in Minnesota.

summit beach park orono

Plan to develop Orono park on hold after Daytons object

The Dayton family donated the land to the city for the park in the 1970s.

covid nurse doctor hospital wikimedia commons

Child from Twin Cities, school staff member die from COVID

Both deaths were reported by the Minnesota Department of Health Thursday.

snow

3 clippers will deliver snow to Minnesota through Tuesday

Clippers move through Friday night, Saturday night and again Monday.

Screen Shot 2022-01-20 at 10.45.51 AM

Video: Inebriated Sheriff Dave Hutchinson after high-speed crash

Hutchinson was unaware of his location and repeatedly said he wasn't driving.

covid

Minnesota's COVID-19 update for Thursday, January 20

A Mayo Clinic data scientists believes omicron may have already peaked in parts of Minnesota, though that reality won't show up in the reported cases until at least next week.

Related