Dried oysters are oysters dried in the sun, oysters are marine creatures, also called oysters, which are of course a non-vegetarian dish.

For Southern Theravada Buddhism, in the Buddha's precepts, bhikkhus are not permitted to eat the following ten kinds of meat: human, elephant, horse, dog, snake, lion, tiger, leopard, panther and bear. In addition to this, a bhikkhu is not permitted to eat the three impure meats that he has seen or heard killed, or suspected to have been killed for him, as well as uncooked meat. In addition to these, it is also not permissible to eat meat that has been obtained through insinuations and other less-than-dharmful means.

Thus, for Theravada monks, dried oysters are permissible to eat as long as they do not violate the previous description.