In This Issue
The Minnesota Department of Natural Resources encourages Minnesotans to contact the state duty officer if they see evidence of a fish die-off in a lake or stream. Fish die-offs can result from a variety of natural and human causes.
“People can help by reporting fish die-offs right away,” DNR Limnology Consultant Tom Burri said. “These reports alert state agencies to the situation and help us determine appropriate next steps.”
To report fish die-offs, people should call the Minnesota duty officer at 651‐649‐5451 or 800‐422‐0798 (the officer line is available 24 hours per day, seven days a week). An early report allows timely water and fish sampling or other response actions, if needed. It’s especially helpful to know what sizes and types of fish people see in a fish die-off.
In early spring, the retreat of lake and stream ice can sometimes leave behind fish that died during ice cover, commonly referred to as winterkill. When snow and ice cover a lake, sunlight reaching aquatic plants is limited. The plants, in turn, reduce the amount of oxygen they produce. If vegetation dies from lack of sunlight or other cause, the plants start to decompose, which uses the limited oxygen that is dissolved in the water. If oxygen depletion becomes severe enough, fish die.
In mid-spring and summer, fish die-offs are often the result of warming water and opportunistic infections that spread in fish populations that are already stressed after the spawning season. Species commonly observed in these die-offs include sunfish, crappies and bullheads, and, occasionally, largemouth bass and northern pike.
When die-offs of wild fish are the result of disease issues, the affected fish tend to be of a single species and size range. By contrast, when die-offs include multiple species and size ranges, human activity is more likely to be the cause.
Human causes of fish kills can include water discharged at high temperatures; discharges or spills of toxic chemicals, including pesticides and fertilizers; manure runoff; and low oxygen levels in a lake resulting from storm water that runs off urban or rural landscapes. Often, there are multiple causes contributing to fish deaths.
More information on fish kills is available on the DNR website (mndnr.gov/fisheries/fishkills.html).
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Anyone with a 2023 Minnesota fishing or hunting license can receive a free special edition orange Minnesota Twins logo cap and a ticket discount thanks to a special ticket offer from the Twins.
That’s right — Minnesota DNR Days are back at Twins games this season, through a partnership between the Twins and the Minnesota Department of Natural Resources.
The Minnesota DNR Days partnership includes six games this year:
- Saturday, April 29 vs. Kansas City Royals, 1:10 p.m.
- Friday, May 26 vs. Toronto Blue Jays, 7:10 p.m.
- Tuesday, June 13 vs. Milwaukee Brewers, 6:40 p.m.
- Sunday, July 23 vs. Chicago White Sox, 1:10 p.m.
- Saturday, Aug. 19 vs. Pittsburgh Pirates, 6:10 p.m.
- Saturday, Sept. 9 vs. New York Mets, 1:10 p.m.
License holders can purchase a discounted game ticket online and receive a special Twins cap at the game. Ticket prices vary by game. License holders must purchase their tickets ahead of time through the DNR’s special Twins page (twins.com/dnr) in order to receive the hat at DNR Days. The person who purchased the tickets must show their hunting or fishing license, or a photo of it, at the game when they pick up the hats. This is a high-demand promotion with a limited quantity of hats. Instructions for purchasing tickets are on the Minnesota DNR Days page (mndnr.gov/twins).
People can buy fishing and hunting licenses at any DNR license agent, online with a mobile or desktop device (mndnr.gov/buyalicense), or by phone at 888-665-4236. Mobile license buyers receive a text or email that serves as proof of a valid fish or game license to state conservation officers.
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