Sardines are deep-sea fish.

The sardine is an offshore warm-water fish, usually inhabiting the pelagic layer, and the adult sardine inhabits deep water beyond 70-80 meters in the fall and winter. Sardines are offshore warm-water fishes, generally not found in the outer seas and oceans, usually inhabiting the pelagic layer, and the adult sardines inhabit deep water beyond 70-80 meters during the fall and winter seasons.

Spring coastal water temperature rise of the fish to the inshore reproductive transition, small fish in the coastal bait growth, summer with the South China Sea warm currents migrate northward, the fall surface water temperature drop, then migrate to the south. Sardines mainly ingest plankton, which varies between adults and juveniles depending on the species, sea area and season.

Golden sardine adults mainly take planktonic crustaceans, including copepods, short-tailed larvae, telopods and mysids, and also diatoms, while sardine juveniles take diatoms and methanogens in addition to planktonic crustacean larvae.

Sardine

The sardine (English name: Sardine, alias: Sardine) is an animal of the genus Sardine in the Herring family, and a non-threatened species on the IUCN Red List of Threatened Species. The sardine has a slightly longer lower jaw than the upper jaw, no visible teeth, a pale back and white belly, a short and only one dorsal fin, no lateral line, and a scaleless head.

It usually inhabits the middle and upper layers of the ocean, and in the fall and winter it inhabits deeper areas, feeding mainly on planktonic crustaceans: it is found in the equatorial oceanic zones at latitudes of 6 to 20 degrees north and south.