Grander Weight Angler Location Date Blue Marlin 1171 Ron Walker and Walt Mahoney Jr. Kona, Hawaii 07/20/88 Capt. Terry Dahl of the GRAND SLAM, a 46-foot Hatteras, raised this 1171-lb blue marlin for anglers Ron Walker and Walt Mahoney Jr. It was the first charter-caught grander in 1988.