The Minnesota Department of Natural Resources said prolonged heat is causing more fish deaths across Minnesota and is encouraging people to report what they see. As of last week, the DNR said it has seen 212 fish mortality reports across 102 bodies of water statewide this year. The agency said recent heat, low precipitation and poor water conditions in some lakes are stressing fish in lakes, rivers and streams. With the current summer conditions, the DNR said surface water temperatures of 86 degrees Fahrenheit and higher have been recorded in several Minnesota lakes and the Mississippi River. How to helpState officials are encouraging Minnesotans to play a role in preserving and protecting fisheries by reporting dead fish to the DNR.