Yan mackerel is a saltwater fish not a freshwater fish. Yan fish is the folklore, also called Yan mackerel, the scientific name should be called Spanish mackerel, Yan fish is common in Jiaodong and Liaodong areas. The meat is very firm, and the texture is also more elastic.

Yan Spanish mackerel is a kind of Spanish mackerel, Spanish mackerel is also known as horse mackerel, also known as blue-spotted horse mackerel. The tail of the Yan mackerel is more peculiar, showing a kind of swallow shape, which is also the origin of the name of Yan mackerel.