To dream of barnacles represents an annoyance that you feel is unnecessary or secondary to the real issue at hand. Feeling that you can’t only deal with a problem or just enjoy yourself because something else is always an issue. Issues that cling on to other issues.
Negatively, barnacles may reflect “adding insult to injury.”
Example: A woman dreamed of cleaning barnacles off a whale. In waking life she had a terminal illness and was always trying to keep spirits high to avoid thinking about death.