Creates a Great Lakes Mass Marking Program inside the U.S. Fish and Wildlife Service to mass-mark hatchery-produced fish in the Great Lakes basin, share marking data with Federal, State, and Tribal fishery managers, and support fisheries management and restoration. It authorizes up to $5,000,000 per year for each fiscal year from 2026 through 2030 to buy equipment, tags, and hire staff, but actual funding will require future appropriations.