Mich. Comp. Laws § 324.47313
All persons engaged in fishing for whitefish, trout, yellow pickerel, or perch in the waters named in this part shall from the beginning of the spawning season for these fish, such time to be determined by test under the direction of the department, until the beginning of the closed season provided by section 47311 and before and after the closed season, strip all ripe fish, both male and female, save all of the spawn, properly impregnate it, and deliver it to the department at its fishing port, and all such persons shall have a sufficient number of people on each boat and all the equipment needed properly to save, handle, impregnate, and deliver such spawn. The saving, handling, impregnating, and delivering of spawn shall be done under the direction of the department and in accordance with such regulations and under such supervision as prescribed by the department. However, the department shall not discriminate against any person engaged in fishing during the closed or open season, having on each boat a sufficient number of people and all the equipment needed properly to save, handle, impregnate, and deliver such spawn at any port or fishing ground when it has been determined that fish are ripe for spawning. This determination shall be made by setting test nets on each fishing ground where spawn will be taken. A person engaged in commercial fishing that fails to properly save, handle, impregnate, and deliver such spawn during any period when spawn are ripe is guilty of a violation of this part. A person shall not take from the waters of the Great Lakes any lake or Mackinaw trout during the closed season established by this part for those fish, except by the use of gill nets, trap nets, and pound nets after tests have been made and the percentage of ripe fish secured as provided for in section 47312.
MCL 324.47313