2. Introduction of silver carp and bighead carp. Silver carp and bighead carp are also called silver carp, silver carp, Baotou fish, bighead carp and herring (silver carp in some places), and some are also called male fish. It looks like a silver carp. Side flat. It is a freshwater fish. The head is large and wide, and the length is about 1/3 of the body length. The mouth is also very wide and slightly upturned. Low eye position. Silver carp and bighead carp filter algae, zooplankton and organic garbage.