Mackerel scientific name is also called sardine, mackerel in China is called by many names, some regions will be directly called mackerel, while some regions will be called spiny Spanish mackerel, barramundi, etc., or called horse mackerel. This fish is not very common, mainly distributed in some coastal areas of China, has a relatively high economic value. In Japan, the greater mackerel is more standardly known as the onyx_, also called the island_ because it is caught in large numbers in the Izu Islands. The mackerel, on the other hand, is called by different names in various places, such as Seki_ in Saga Seki, Tan_ in Miyazaki Prefecture, and so on. The mackerel is a silver-bodied fish, while the onyx is a white-fleshed fish. The mackerel's body length is about 35cm, while the onyx's body length can reach up to 1.2m, and the two merely look similar, but the large mackerel is called the big mackerel due to its larger size.