How Many Calories are in a Whole Mackerel? Understanding the Nutritional Facts
                                
                                
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                                    3 min read                                
                            
                                A standard 100-gram serving of Atlantic mackerel contains approximately 205-262 calories, but the calorie content of a whole mackerel depends on its overall size and species. This nutrient-dense, oily fish is celebrated for its health benefits, including a high concentration of omega-3 fatty acids.