Ah, the very vague "serving". Usually, a "serving" of a protein food such as fish or chicken or whatever, is 3 oz. If you search for "mackerel" in the Nutrition Tracker, it will give you the USDA entry for mackerel. Includes the choices of "serving" or "oz." or "grams". The user-entered entries under "fillet of mackerel" usually just say "serving"-- they *might* have been referring to one fillet or maybe 3 ounces or maybe... who knows. Personally I'd use the USDA "mackerel" entry, and weigh my slab of fish.
Ruth in Cookeville, TN Central Time Zone
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