Migratory Bird Hunting; Approval of Tungsten-Matrix Shot as Nontoxic for Hunting Waterfowl and Coots

The U.S. Fish and Wildlife Service (Service or we) amends 50 CFR 20.21(j) to grant final approval of tungsten-matrix shot as nontoxic for hunting waterfowl and coots. Acute toxicity studies reveal no adverse effects over a 30-day period on mallards (Anas platyrhynchos) dosed with tungsten-matrix shot. Reproductive/chronic toxicity testing over a 150-day period indicated that tungsten-matrix administered to adult mallards did not adversely affect them or the offspring they produced. We also remove 50 CFR Subpart M (Part 20-- Migratory Bird Hunting)--Criteria and Schedule for Implementing Nontoxic Shot Zones for the 1987-88 and Subsequent Waterfowl Hunting Season because implementation of nontoxic shot zones in the United States was completed in 1991.