Too much oxygen kills fish in Lake Owasso in Ramsey County

  • Article by: Doug Smith , Star Tribune
  • Updated: December 3, 2013 - 6:14 PM

DNR believes quirk of nature hit Lake Owasso last week.

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batman50Dec. 2, 1310:23 PM

I'm calling a big BS on this one. DNR will just cover up the fact that they gave a permit to the Lake Association to kill off the weeds in the lake and happen to kill all of the fish too. Nothing 'natural' about this fish kill. It happens in shallow lakes at the end of the winter with deep ice and snow sure- but this is a nice little cover up. Keep walking folks- nothing to see here! ;-/

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dogboy714Dec. 2, 1310:58 PM

There is nothing natural about the fish kill happening on Owasso. I'll bet the DNR can't show me ONE instance of a complete kill happening in late fall or any other time of year besides late winter. Every single fish is dead on Owasso. Tiny panfish to 30" walleyes and big muskies. Their response is timed perfectly with the snow - now you can't see them, but they are there. And the DNR knows why.

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knight63Dec. 3, 13 2:13 AM

However it happened, and whether anyone is responsible or not, its a shame.

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adamkotelDec. 3, 13 5:06 AM

And why is there toooo many weeds in the lake? Are there farm fields around there. The run off of all the fertilizers the farmers put on on fields. Plus the fact they are tileing the fields to the creeks. Now where do you think thats traveling too... What that equals to is plant growth in the lakes!

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clnorthDec. 3, 13 7:40 AM

adamkotel. How many homeowners mow the grass right up to the lake? They fertilize their lawns to make them nice and green. It does the same thing to the lake.

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reader2580Dec. 3, 13 7:45 AM

Lake Owasso is in a suburban area. I live across the street from the lake and I am not aware of any farm fields within miles of the lake. Folks fertilizing lawns would be a more likely cause for weed growth in the lake. I personally didn't put any chemicals on my lawn this year, but mot of my neighbors do.

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flusher75Dec. 3, 13 7:52 AM

Too much oxygen? Ha! Ha! Ha! That's funny. I've seen bodies of water in MN hit 200 +% dissolved oxygen every afternoon day after day after day without killing a single fish or fish showing any signs of stress. Public employees shouldn't be allowed to tell fibs to us.

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flusher75Dec. 3, 13 7:57 AM

Look up the dissolved oxygen/temperature table and you'll see that at just above freezing DO saturation is 14 ppm. What really happened?

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davehougDec. 3, 13 9:09 AM

I am surprised at the lack of trust in the DNR. I doubt they would state something others who know lakes would say is impossible. I for one will trust the DNR on this.

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greigisDec. 3, 1311:46 AM

If we believe that there was too much oxygen in Lake Owasso, and this is what killed nearly all of the fish, then why didn't it happen to the rest of the lakes without snow cover? One would think at least one other similarly situated lake would have had a fish die-off as well. The key variable was the late spraying which killed the native plants and grasses, and it turned the water green. I doubt much light could have penetrated through green water to cause too many plants to grow soon after so many were doused with herbicide. I think there is something rotten going on, how about you?

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