Great Lakes Mass Marking Program Act

This bill establishes the Great Lakes Mass Marking Program within the U.S. Fish and Wildlife Service to tag hatchery-raised fish stocked in the Great Lakes. It requires tagging 9-11 million fish annually using automated technology, with data shared to help state, tribal, and federal agencies manage fisheries. The program supports decisions on fish stocking rates, habitat restoration, and balancing predator-prey relationships to sustain recreational, commercial, and Tribal fisheries. The bill authorizes $5 million yearly (2025-2029) for equipment, personnel, and data sharing to improve Great Lakes fishery management.