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Calories in Swordfish. The favorite choice for the term Swordfish is 1 piece of Swordfish which has about 160 calories. Calorie and nutritional information for a variety of types and serving sizes of Swordfish is shown below. Popular Serving Sizes of Swordfish.
Steps. 1  1. Create a marinade for the swordfish steaks, as a marinade adds flavor and keeps the swordfish moist and tender. A marinade can consist of a variety of ingredients depending on your preferences. 2  2. Marinade the swordfish steaks in a plastic or glass bowl in your refrigerator for at least 4 hours.