Seven carp is a sturgeon, also known as seven floats and seven carp, which is very similar in shape to a herring. The most obvious difference is that its mouth is small, its lips are wrinkled and shaped like petals. The cheek membranes are not connected, and there are several verrucous protrusions on the ventral surface of the kiss and in front of the whiskers, hence the name "Seven Floats". Sturgeon is distributed in Heilongjiang, Wusuli River and the lower reaches of Songhua River, Nenjiang River and other waters. It is a paleontology preserved during the Cretaceous period. It once lived with dinosaurs on the earth and is known as the living fossil in water. It is the general name of sturgeon and Darkskin.

The adult sturgeon can reach 1000 kg, which is the largest freshwater fish in China. Sturgeon is one of the paleontological groups preserved in Cretaceous period, and its number is extremely rare, so it has the reputation of panda in water. 1998 The sturgeon was recognized as an endangered species by the Washington Convention of the United Nations.