Lay the fish in a shallow dish, make a few slashes in the flesh with a sharp knife. Pour marinade over the fish, place in fridge to marinate for at least 2 hours.
Place fish and marinade in a baking dish and bake in a preheated 400 F° oven until cooked and slightly charred, about 15-20 minutes.
Heat tacos shells. Place fish in tacos & top with corn mango salsa and cilantro.