MINNEAPOLIS (AP) — Fisheries managers have imposed the tightest restrictions yet for the upcoming season on Mille Lacs Lake, allowing anglers to keep only one walleye instead of two.

The Department of Natural Resources also says an extended night walleye ban will take effect the Monday after the opener on Saturday, May 9. The ban will extend to Dec. 1.

The new regulations will let Mille Lacs sport anglers to keep one walleye 19 to 21 inches long, or one over 28 inches. Last year, Mille Lacs anglers could keep two walleye 18- to 20-inches long or one longer than 28 inches.

The DNR says the restrictive regulations are necessary to keep the walleye harvest within the established safe harvest level. The target has been reduced from 60,000 to 40,000 pounds for 2015.