1, Silurus, commonly known as Silurus japonicus, is mainly distributed in Heilongjiang River system, Songhua River, Nenjiang River and Wusuli River from Heihe City to Fuyuan County.

2. Catfish is a kind of fish in Silurus, also known as silver carp and sticky fish. Catfish is the most widely distributed fish in Silurian, and it is distributed all over the world.