Michigan DNR

Several Great Lakes states, including Michigan, employ US Fish and Wildlife Service mass marking assistance to mark popular gamefish such as steelhead, Chinook salmon, Atlantic salmon, brown trout, and lake trout. Because the tag is so little, roughly the size of the tip of a lead pencil, lab workers must remove it. Anglers who catch a fish with an adipose fin cut should submit it in at a Michigan drop-off station.