The stock can be a source of salt and the oysters are definitely a source of salt, so I am always careful when adding more. Oysters grow in saltwater and have a wonderful briny, salty flavor which varies depending upon where the oysters were harvested. I don't add salt when making stock but commercial stock usually contains salt. For this Dressing, I do not add much salt until after I add the stock and the oysters. Taste the dressing for seasonings AFTER you add the oysters and then add the amount of salt you want.