Heat food-safe stones of your choice in a 475 degree F oven a minimum of 2 hours. Prepare the 3 different marinades separately. Add fish to appropriate marinades and let rest in a cool place for a minimum of 1 hour. Remove stones carefully from oven and place on a salted tray. Cook fish separately on each stone for 1 to 2 minutes each side. Remove fish from rocks and place on desired garnishes.