Sardine is the collective name for certain food fish of the genera Sardine, Small Sardine and Mimic Sardine and the family Herring in the order Herringiformes of the order Scleractinia. It also refers to common herring (Clupea harengus), which is canned in oil, and other small herring or herring-like fish.

Sardines are known in Hong Kong as sardines, also known as sardines, sardines and trevally. It is two inches long for small ones and about a foot for large ones, with a slightly longer lower jaw than the upper jaw, no visible teeth, a pale back and a white belly, and a beautiful meat, which is often used for canned food. Originally captured in Sardinia, Italy and named, the ancient Greek called it "sardonios" means "from the island of Sardinia". It is distributed in the equatorial marine area of latitude 6 to 20 degrees north and south.

Sardines are mainly used for food, but their flesh can also be used as animal feed. The use of sardine oil includes the manufacture of paints, pigments and linoleum, and in Europe it is also used to make margarine. It is also an economically important marine fish in the world.

Sardines are incredibly nutritious, rich in phospholipids (OMEGA-3 fatty acids), protein and calcium. According to the website of the American Cardiovascular Society, this special fatty acid can reduce the production of triglycerides (harmful fatty acids that cause blood clots) and has the amazing effect of gradually lowering blood pressure and slowing down the rate of atherosclerosis. Pregnant women should eat more fish during pregnancy, such as sardines, which are rich in phospholipids. At the same time, the phospholipids in sardines have a favorable effect on promoting the brain development of the fetus. Besides phospholipids, sardines also contain a lot of calcium, especially in the fish bones. The fish bones of canned sardines are fluffy and safe to eat. Our body needs enough minerals, and sardines are also suitable for people of all ages due to their rich calcium content, which can be absorbed through cooked sardines. Canned sardines can be served in a variety of ways, can be made into sandwiches, and are also a great accompaniment to meals on people's tables.