Mich. Comp. Laws § 324.47306
A person shall not place or set any kind of a net or set hook lines or take or attempt to take any kind of fish with a net or set hook lines, except minnow seines as provided in section 47309, in any of the connecting waters between Lake Superior and Lake Huron and the connecting waters between Lake Huron and Lake Erie. For the purposes of this part, the connecting waters between Lake Superior and Lake Huron are all of that part of the straits of St. Mary in this state, extending from a line drawn from Birch point range front light to the most westerly point of Round island, thence following the shore of Round island to the most northerly point thereof, thence from the most northerly point of said Round island to Point Aux Pins light, Ontario, to a line drawn east and west from the most southerly point of Little Lime island; and the connecting waters of Lake Huron and Lake Erie are all of the St. Clair river and all of lake St. Clair and all of the Detroit river extending from fort Gratiot light in Lake Huron to a point in the lower Detroit river where the center line of Oak street, city of Wyandotte, Wayne county, Michigan, extended due east, would intersect the international boundary line. The boundary line between Lake Michigan and Lake Huron is a line extending due north from old Mackinac point lighthouse across the straits of Mackinac.
MCL 324.47306