 The Connecticut Department of Environmental Protection stocks the river with broodstock Atlantic Salmon between Route 118 in Harwinton/Litchfield and the Thomaston Dam, and from southern Naugatuck to Beacon Falls.The Naugatuck has a trout management area between Route 118 and the Thomaston Dam.It is considered a "trophy trout stream" the rest of its length between the confluence of the East and West Branches and the Kinneytown Dam in Seymour.