Underwater Sardine Dance

Sardines are canned in many different ways. At the cannery, the fish are washed, their heads are removed, and the fish are cooked, either by deep-frying or by steam-cooking, after which they are dried. They are then packed in either olive, sunflower or soybean oil, water, or in a tomato, chilli or mustard sauce.
• Canned sardines
Canned sardines in supermarkets may actually be "sprat" (such as the “brisling sardine”) or round herrings. Fish sizes 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). If not, they should be purged of undigested or partially digested food or feces by holding the live fish in a tank long enough for them to empty their digestive systems.