To dream of eating oysters, means that he is losing the confidence of himself, that generates works of dubious origin and a lack of ethics in his works. This could trouble you with justice and involve your family in unworthy incidents.
If you sell oysters in your dream, indicate that you are in the search for new loves, the ideal couple or to live new adventures without long-term commitment. If he is single, this dream would benefit him, but if he is married he would cause many problems with his partner or that does not satisfy him completely.
The shells of the oysters in dreams, suggests economic losses and a relative pause of their personal projects. While helping others is good, you leave aside many of your own initiatives, which in the long run would frustrate you.