Black herring, also known as black fin, is a kind of tender meat in freshwater fish with cylindrical body length, black spines, milky white abdomen and full white meat. It contains a lot of fat, especially pectoral fins and head and tail. The lungs of herring are the most tender part of fish and contain a lot of fat. The famous dish "Burn Bald Lung" is made of herring's lung. When cooked, it is delicious while it is hot.