This bill establishes the Great Lakes Mass Marking Program within the United States Fish and Wildlife Service, tasked with implementing the **mass marking of hatchery-produced fish** across the Great Lakes basin. The program's primary goal is to evaluate the effectiveness of hatchery operations and various fisheries management actions, thereby supporting the overall health of Great Lakes fisheries, and the Director is authorized to acquire necessary equipment, fish tags, and personnel for tagging and data recovery operations. A crucial aspect of the program is **required collaboration** with Federal, State, and Tribal fish management agencies, as well as other relevant bodies. The data collected will be made available to these partners to enhance understanding of management outcomes, meet restoration objectives, support the economic viability of Tribal, recreational, and commercial fisheries, and evaluate habitat restoration efforts. Ultimately, this initiative seeks to provide a science-based foundation for informed decision-making regarding fish stocking rates, species rehabilitation, and habitat restoration in the Great Lakes. The bill authorizes an appropriation of **$5,000,000 annually** for fiscal years 2026 through 2030 to fund these efforts.