How are oysters preserved in various types of Korean kimchi? What are the common methods of preserving oysters in grocery stores? Do any of #1 or #2 not require refrigeration?
Oyster
In some types of Korean kimchi, oysters are placed between the leaves of nappa cabbage.  Many grocery stores carry canned oysters in the shelf stable section. 
salt-water bivalve mollusc
Can oysters be preserved without refrigeration? 