Mich. Comp. Laws § 324.47322
A person shall not set or use nets, set hook lines, or any other continuous device in any of the waters mentioned in this part without marking its location by buoys and identifying the nets or other devices by showing the license number in plain figures upon the bowls of the buoys of the person using the nets, set lines, or other devices; the license number to be attached to all gill net buoys; to the stakes at the heart or pot of pound nets; to the lifting buoy of trap nets, where the heart and pot are set below the surface of the water; to a buoy at the point of heart or pot of fyke nets where the cover of the hearts or pots comes to the surface of the water. However, when any of the nets, set hook lines, or other devices are set under the ice, their location shall be marked by a stake extending not less than 4 feet above the ice at each end of the net or nets, set hook lines, or other continuous device and the license number, in legible figures, shall be attached to each stake or to the ends of the net or nets, set hook line, or other device.
MCL 324.47322