How Much Iodine Is In Freshwater Fish?

How Much Iodine Is In Freshwater Fish? Giving a very rough estimate, or average, saltwater fish has 330 micrograms of iodine per 100 grams of body weight, whereas freshwater fish has 66 mcg/g. Two other foods are higher in iodine content than saltwater fish — dried kelp, with 62,400 mcg/g; and iodized salt, with 7,600