What is the primary purpose of marinating fish before cooking?

The primary purpose of marinating fish before cooking is to enhance flavor. Marinades typically consist of acidic ingredients (like vinegar or lemon juice), oils, and various seasonings that, when combined, penetrate the fish over time. This process infuses the fish with distinct flavors, making it more palatable and appealing.

While it’s true that marinating can also tenderize the flesh, especially in tougher cuts of meat, fish is generally delicate and doesn't require as much tenderizing. Altering the color is not a primary purpose of marinating; fish color can change naturally during cooking. Although marinating can influence cooking time slightly by adding acidity or moisture, that is not its main function. Enhanced flavor is the key reason cooks choose to marinate fish prior to preparation.