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Oxygen levels bump up in some Minnesota lakes, potentially impacting fish

This winter and last winter are stark departures from the low-oxygen concerns during the 2022-2023 winter, when heavy snowfall blocked sunlight from aquatic plants and reduced oxygen levels in lakes. (Eric Morken photo)

While hard-water anglers are reveling this season with the opportunity to fish on thick, clear ice, the clarity and a relative lack of snow have turned some lakes into “greenhouses,” allowing aquatic plants to more readily produce oxygen.
“I haven’t seen this quality (of) ice very often in 35 years. So, it’s pretty unique. We got a real greenhouse effect going on, basically, with that clear ice,” said Chris Domeier, Ortonville area DNR fisheries supervisor.

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