Salmon is a very nutritious fish. It’s high on protein and calcium. One 100 gram piece of salmon fish contain 12 gram of total fat, 21 g of protein, 13 mg of calcium, 405 mg of potassium. 120. Tuna fish is high on nutritious elements but don’t have as much fat as Salmon does. Tuna is a favorite fish to make sushi with. Check out full sushi calories chart too! 100 grams (3.5 oz) of tuna fish contain 1.1 g of total fat, 25 gram of protein, 17 mg of calcium, 500 mg potassium.