<P> The nutritional content of albacore may vary naturally from catch to catch . In particular, the fat and calorie content will differ depending on the region or depth where the fish are caught . Albacore tuna that swim close to the water surface can be higher in fat than tuna caught in deep ocean waters--but they are also lower in mercury content and higher in omega - 3 content . Because availability of albacore tuna may vary from season to season, we use two different labels to accurately show the fat and calorie content of the product contents . </P> <P> A larger, commercially prepared tuna fish sandwich has more calories than noted above, based on its serving size . A 6 - inch Subway tuna sub of 238 grams has 480 calories, 210 of those from fat, 600 miligrams of sodium, and 20 grams of protein . </P>

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