Not sure seaweed would make a good wine but sea vegetables including nori, arami, kombu, wakame, dulse are really very tasty (I am a vegetarian and they are part of my diet along with wheat gluten (seitan) and the people who harvest and sell them have convinced many people that they are able to provide these plants with no trace of animal product. (They can be bought with kosher certification which in fact means that no larvae or crustaceans are known to be present and so are presumably farmed in ponds that are free of such animals) .