Water is Everyone's Business, an excellent video from the Rice Creek Watershed District about AIS in Minnesota, featuring Dr. Peter Sorensen, a top aquatic invasive species scientist in the state:
Zebra Mussels were discovered on Lake Johanna on 9-18-2018. See the full report here.
Instructions from the MN DNR about how to easily monitor for Zebra Mussels from your dock.
Lots more information about Zebra mussels on Lake Johanna in various reports in the Resource Center.
Minnesota Aquatic Invasive Species Research Center at the U of M
An excellent full-color AIS Identification Guide created by the MAISRC and U of M Extension (56-page PDF file)