Is Pickled Herring High In Mercury?

Is Pickled Herring High In Mercury? Herring contains less mercury than other omega-3-rich fish you may be eating, like tuna, king mackerel, swordfish and halibut. Is pickled herring bad for cholesterol? A new experiment shows eating pickled herrings for lunch five days a week can increase levels of ‘good cholesterol‘. Five Volvo workers in Gothenburg