Rinse Ahi with cold water; pat dry with paper towels. Set aside. Blend together yogurt, marmalade, 2 teaspoons lime juice and curry powder. Chill for 15-20 minutes. Combine oil, 2 tablespoons lime juice and salt. Baste Ahi with oil mixture. Broil on a well-greased broiler pan 5-6 inches from source of heat. Cook 8 minutes per inch of fish, measured at thickest point, turning once and basting frequently. Do not overcook. Ahi should be pink in center when removed from heat. Serve with curry-yogurt sauce. Garnish with assorted fresh fruit such as sliced strawberries, melon and grapes.