Simply seeing an oyster in a dream can signify that you should try and make every conceivable effort to control your aggressive tendencies as this might offend the people that are around and it might cost you a lot profit in your professional life.
Opening an oyster shell in the dream is a positive portent especially if the shell is not empty inside. If you open the shell and find a pearl inside that you can expect that soon you will have great streak of luck. Alternatively, this dream can be interpreted as you inheriting something of great value in a rather sudden manner.
A dream in which you would open an oyster shell but only find it to be empty can be interpreted as being less positive. This dream can signify that you will get a promise which will be broken or a deal which will fall through. Aside from emotional stress this can also cause some loss of income also.
Seeing a lot of oysters on beach in your dream means that you need to be careful in the upcoming time in regards to the legality of your actions in the professional life as you might be under scrutiny from someone.
Eating oysters in a dream signifies that soon someone will open up your heart to you in a very sincere manner. Emotional support will be required from you in a sense and you will give it with no regrets of doing so.
According to some interpretations eating oysters is sign of great riches that will be earned by using some great talent of yours.
If you dream that you are selling oysters it means that you should be careful of not going too far with your attempts of getting close to some person. Your efforts might get branded of being obtrusive while they might not seem to be to you.