The duckbill is a kind of fish in the genus Kissing Perch of the family Carpidae, which is mainly distributed in the areas of Heilongjiang, Songhua and Ussuri rivers in China. Due to long-term overfishing and environmental pollution, the number of wild duckbill fish has decreased dramatically. This situation has aroused concern and protection of the duckbill population. In order to protect the ecosystem and populations of the duckbill, the Chinese government has included the duckbill in the List of National Key Economic Aquatic Animal and Plant Resources for Protection and categorized it as a second-class protected animal.