Luna warned us loudly and vehemently about these "invaders". We tried to tell her how much we enjoy their company--there were at least 20 of them swimming around--but she would have none of it. Invaders are invaders, it's her boat, and she wasted no time telling them to mind their own business and move onto to a different boat. We were grossly disappointed. Maybe they would have left almost as quickly as they arrived regardless, but our experience is they tend to hang out for awhile, swimming and playing at the bow. But then again, I don't believe Luna has ever barked at one before. We're going to have to work on this....