Is Pickled Herring High in Mercury? Understanding the Levels
                                
                                
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                                    4 min read                                
                            
                                According to the U.S. Food and Drug Administration (FDA), herring averages only 0.078 parts per million (ppm) of mercury, making it a very low-mercury fish. Therefore, consumers can be reassured that pickled herring is not high in mercury and is a safe and healthy option to include in their diet.