Great Lakes Mass Marking Program Act of 2025

What the bill does

This bill provides statutory authority for a program of the U.S. Fish and Wildlife Service (FWS) for the mass marking of hatchery-produced fish in the Great Lakes basin. Mass marking is the practice of tagging large numbers of hatchery-produced fish in order to distinguish them from the wild fish population. The FWS initiated the program in 2010 on a limited scale. Under the existing program, the FWS (1) tags hatchery-produced fish stocked in the Great Lakes, and (2) produces data used by state and tribal fish management agencies to make management decisions regarding Great Lakes fisheries.

Summary by the Congressional Research Service, Jul 18, 2025.