However, it is best to eat oysters alive after purchase, so that they can absorb rich nutrients and taste more delicious. So how can I buy live oysters? The easiest way is to find those guys who have the strength to close the shell when choosing oysters. When choosing, first look at whether some of these oysters are slightly open. Live oysters shut up at the first sign of trouble, so they also pat the edge of their shells. If they close immediately, they will be fresh oysters. If you don't even have the strength to close the shell, you must be dead.