Sardines are sardines, sardines, sardines, sardines, sardines, sardines and other edible fish. Also refers to common herring (Clupea harengus) and other small herring or herring-like fish made into canned fish in oil.
Sardines are called sardines in Hongkong, also known as Sa Ding fish, mackerel and roe. The smallest is two inches long and the largest is about a foot long. The lower jaw is slightly longer than the upper jaw, the teeth are not obvious, the back is pale and the abdomen is white, and the meat is beautiful. It is mainly used to make canned food. It was originally captured in Sardinia, Italy, hence its name. In ancient Greek, it was called "sardonios", which means "from Sardinia". It is distributed in the temperate marine area of 6 ~ 20 degrees north and south latitude.
Living habits
Sardines are offshore warm-water fish, which are generally not found in the high seas and oceans. They swim fast and usually inhabit the upper and middle layers, but they inhabit deeper waters when the surface water temperature is low in autumn and winter. The optimum temperature of most sardines is about 20 ~ 30℃, and only a few species have lower optimum temperature, such as the optimum temperature of sardines in the Far East is 8 ~ 19℃.
Sardines mainly feed on plankton, which varies with species, sea areas and seasons, as well as adult fish and juvenile fish. For example, adult sardines mainly feed on planktonic crustaceans (including copepods, short-tailed larvae, crustaceans and mysids) and diatoms.
Young fish eat diatoms and dinoflagellates in addition to planktonic crustaceans. Golden sardines generally don't migrate long distances. Adult fish live in deep water 70 ~ 80 meters away in autumn and winter. In spring, when the coastal water temperature rises, fish will migrate to the near shore to breed.
Larvae and juvenile fish feed and grow along the coast, and gradually move northward with the South China Sea warm current in summer. In autumn, the surface water temperature drops, so it migrates south. After 10 months, when the fish has grown to more than 150 mm, it gradually migrates to deeper waters due to the decrease of coastal water temperature.