Any of certain species of small (6–12 in., or 15–30 cm, long) food fishes of the herring family (Clupeidae), especially in the genera Sardina, Sardinops, and Sardinella. The common herring (Clupea harengus) is found throughout the North Atlantic. The five species of Sardinops live in the Pacific and Indian oceans. Sardines are small, silvery, slender fishes with a single short dorsal fin and no scales on the head. They live in dense schools, migrating along the coast. They are usually fished with an encircling net, particularly the purse seine, and mainly at night, when they surface to feed on plankton. Seealso pilchard, sprat.
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Sardines, or pilchards, are a group of several types of small, oily fish related to herrings, family Clupeidae. Sardines were named after the island of Sardinia, where they were once in abundance.
The terms are not precise, and the usual meanings vary by region; for instance, to many people a sardine is a young, European pilchard. A generalisation is that if the fish is under 4" long (10 cm) it is classed as a sardine, and if larger than 4 inches it is classed as a pilchard. The FAO/WHO Codex standard for canned sardines cites 21 species that may be classed as sardines; FishBase, a comprehensive database of information about fish, lists at least six species called just "pilchard," over a dozen called just "sardine", and many more with the two basic names qualified by various adjectives.
Canned "sardines" in supermarkets may actually be sprats (such as the "brisling sardine") or round herrings. The actual sizes of the fish canned vary by species. Good quality sardines should have the head and gills removed before packing. They may also be eviscerated before packing (typically the larger varieties), or not; if not eviscerated they should be free of undigested or partially digested food or feces (accomplished by holding the live fish in a tank for long enough that their digestive systems empty themselves). They may be packed in oil or some sort of sauce.
The industry has featured in numerous works of art, particularly by Stanhope Forbes and other Newlyn School artists.
A traditional Cornish pilchard dish is stargazy pie or starry gazy pie.
Sardines are healthy and considered a "brain food." These fish are rich in omega 3 fatty acids, which can help maintain a healthy heart. Recent studies suggest that omega-3 fatty acids slow the progression of mild to moderate Alzheimer's disease. These fatty acids can also help control blood sugar level. Not only are sardines packed with omega-3 fatty acids, but they are also a good source of vitamin D, calcium, B12 and protein.
Sardines are extremely low in contaminates such as mercury.