Grease a piece of heavy-duty aluminum foil well. Place on baking sheet. Turn up edges of foil so juices will not run off. Place filets on foil, skin side down. With a sharp knife, score fish in crisscross fashion. Squeeze lime juice over surface. Let stand 30 minutes before broiling.
Preheat broiler. Spread surface of fish with mayonnaise. Place baking sheet 5″ f