Preserved fish refers to fish that has been treated to extend its shelf life and prevent spoilage. Common methods of preservation include salting, smoking, and canning. These techniques not only help in storage but also enhance the flavor of the fish. This type of fish is popular in many cultures and can be found in various forms, such as dried fish or pickled herring. Preserved fish is often used in traditional dishes and can be a convenient source of protein, making it a staple in many households around the world.