Sardine fish are small, oily fish that belong to the HERRING family. They are commonly found in the Mediterranean Sea and the Atlantic Ocean. The two most common types of sardine fish are BRISLING and HERRING. BRISLING is a type of small HERRING that is usually canned and eaten as a snack or used in salads. HERRING is a larger type of fish that is often smoked or pickled and served as a side dish. Both types of sardine fish are high in protein and omega-3 fatty acids, making them a healthy choice for those looking to add more seafood to their diet.