days ago a recipe for gilthead in salt was posted on a certain site that's of no use to you, because it's in Croatian and translators don't work that good yet.
(Clean the fish, dry it well. Put it on two fingers deep layer of sea salt and then cover with sea salt. Bake in the oven for 1 hour at approximately 200 Celsius. Crush the salt crust, sprinkle with chopped parsley and garlic, pour some olive oil on it.)