Great Lakes Mass Marking Program Act of 2025

This bill establishes the Great Lakes Mass Marking Program, requiring the U.S. Fish and Wildlife Service to tag hatchery fish (9-11 million annually) with automated markers to track their impact alongside wild fish. It directly affects state and tribal fish management agencies in eight Great Lakes states, providing them with data to adjust stocking rates, evaluate habitat restoration, and balance fish populations. Key provisions mandate collaboration with state, tribal, and federal agencies, make program data publicly available for management decisions, and authorize $5 million yearly for 2026-2030 to fund tagging equipment, personnel, and data analysis. The program aims to improve science-based management of Great Lakes fisheries, supporting both ecological health and the $7 billion regional economy dependent on fishing.