For a charcoal grill, place fish on the greased grill rack directly over medium coals. If desired, cover grill grate with foil before placing fish. Grill, uncovered, for 8 to 12 minutes or until fish begins to flake when tested with a fork, turning fish once halfway through grilling. (For a gas grill, preheat grill. Reduce heat to medium. Place fish on a greased grill rack over heat. Cover and grill as directed.) Cover fish to keep warm.