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Cured fish

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Equipment for curing fish used by the North Carolina Algonquins, 1585

Cured fish is fish which has been cured by subjecting it to fermentation, pickling, smoking, or some combination of these before it is eaten. These food preservation processes can include adding salt, nitrates, nitrite[1] or sugar, can involve smoking and flavoring the fish, and may include cooking it. The earliest form of curing fish was dehydration.[1] Other methods, such as smoking fish or salt-curing also go back for thousands of years. The term "cure" is derived from the Latin curare, meaning to take care of. It was first recorded in reference to fish in 1743.[2]

History

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Salt is "the oldest and best known of preserving agents... its chief action appears to be due to its power of attracting moisture, and thus extracting fluid to harden the tissues"

– Edward Smith, 1873 [3]

According to Binkerd and Kolari (1975), the practice of preserving meat by salting it originated in Asian deserts.[4] "Saline salts from this area contained impurities such as nitrates that contributed to the characteristic red colour of cured meats. As early as 3,000 BC in Mesopotamia, cooked meats and fish were preserved in sesame oil and dried salted meat and fish were part of the Sumerian diet. Salt from the Dead Sea was in use by Jewish inhabitants around 1,600 BC, and by 1,200 BC, the Phoenicians were trading salted fish in the Eastern Mediterranean region. By 900 BC, salt was being produced in "salt gardens" in Greece and dry salt curing and smoking of meat were well established. The Romans (200 BC) acquired curing procedures from the Greeks and further developed methods to "pickle" various kinds of meats in a brine marinade. It was during this time that the reddening effect of salting was noted. Saltpeter (potassium nitrate) is mentioned as being gathered in China and India prior to the Christian era for use in meat curing... In Medieval times, the application of salt and saltpeter as curing ingredients was commonplace and the reddening effect on meat was attributed to saltpeter."[3]

Salt curing

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Salmon prepared for curing
See also: Salted fish

Salt (sodium chloride) is a primary ingredient used to cure fish and other foods.[5] Removal of water and addition of salt to fish creates a solute-rich environment where osmotic pressure draws water out of microorganisms, retarding their growth.[5][6] Doing this requires a concentration of salt of nearly 20%.[6] Iodized table salt may be used, but the iodine generally causes a dark end product and a bitter taste. Non-iodized salts like those used for canning and pickling foods and sea salt are the preferred types of salt to use for curing meats.

Sugar curing

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Sugar is sometimes added when curing fish, particularly salmon. The sugar can take many forms, including honey, corn syrup solids, and maple syrup.[7] Adding sugar alleviates the harsh flavor of the salt.[5] It also contributes to the growth of beneficial bacteria like Lactobacillus by feeding them.[8]

Nitrates and nitrites

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Nitrates and nitrites have been used for hundreds of years to prevent botulism in fish and ensure microbial safety. Nitrates help kill bacteria, produce a characteristic flavor, and give fish a pink or red color.[9] Nitrite is commonly used to speed up the curing of meat and also impart an attractive colour while having no effect on the growth of the Clostridium botulinum bacteria which causes botulism.[10][11]

The use of nitrates in food preservation is controversial, and some traditional and artisanal producers avoid using them. This is due to the potential for the formation of nitrosamines when the preserved food is cooked at high temperature.[9] However, the production of carcinogenic nitrosamines can be potently inhibited by the use of the antioxidants Vitamin C and the alpha-tocopherol form of Vitamin E during curing. A 2007 study by Columbia University suggests a link between eating cured meats and chronic obstructive pulmonary disease. Nitrites were posited as a possible cause.[12] The use of either compound is carefully regulated.[9] For example, the FDA Code of Federal Regulations states that sodium nitrite may be safely used: "As a color fixative in smoked cured tunafish products so that the level of sodium nitrite does not exceed 10 parts per million (0.001 percent) in the finished product... As a preservative and color fixative, with or without sodium nitrate, in smoked, cured sablefish, smoked, cured salmon, and smoked, cured shad so that the level of sodium nitrite does not exceed 200 parts per million and the level of sodium nitrate does not exceed 500 parts per million in the finished product."[13]

Smoking

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Main article: Smoked fish

Fish can also be preserved by smoking, which is drying the fish with smoke from burning or smoldering plant materials, usually wood. Smoking helps seal the outer layer of the food being cured, making it more difficult for bacteria to enter. It can be done in combination with other curing methods such as salting. Common smoking styles include hot smoking, smoke roasting and cold smoking. Smoke roasting and hot smoking cook the fish while cold smoking does not. If the fish is cold smoked, it should be dried quickly to limit bacterial growth during the critical period where the fish is not yet dry. This can be achieved by drying thin slices of fish.

Cured fish dishes

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For a list of fermented fish dishes, see Fermented fish.
See also: List of smoked foods § Fish

Europe

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Africa

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East Asia

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Southeast Asia

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South America

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See also

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Notes

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  1. ^ a b "Historical Origins of Food Preservation." University of Georgia, National Center for Home Food Preservation. Accessed June 2011.
  2. ^ "Cure" Online Etymology Dictionary. Retrieved 23 July 2012.
  3. ^ a b Bryan, N. S.; Loscalzo, J. (2011). Nitrite and Nitrate in Human Health and Disease. Springer. p. 71. ISBN 9781607616153.
  4. ^ Binkerd, E. F.; Kolari, O. E. (1975). "The history and use of nitrate and nitrite in the curing of meat". Food and Cosmetics Toxicology. 13 (6): 655–661. doi:10.1016/0015-6264(75)90157-1. PMID 1107192.
  5. ^ a b c Ray, Frederick K. Oklahoma Cooperative Extension Service (PDF) (Report). Oklahoma State University. Retrieved 15 December 2010.
  6. ^ a b "Curing and Brining (food preservation)" (PDF). Science of Cooking. Minnesota State University. Archived from the original (PDF) on 27 September 2011. Retrieved 15 December 2010.
  7. ^ "Additives Used in Meat". Meat Science. Illinois State University. Archived from the original on 2 May 2010. Retrieved 16 December 2010.
  8. ^ "What Is Curing?". Science of Cooking. EDinformatics. Retrieved 16 December 2010.
  9. ^ a b c "Curing Food". Edinformatics. Retrieved 21 February 2010.
  10. ^ Wilson, Bee (2018-03-01). "Yes, bacon really is killing us". The Guardian. London. ISSN 0261-3077. Archived from the original on 2021-02-10. Retrieved 2021-02-14. In trade journals of the 1960s, the firms who sold nitrite powders to ham-makers spoke quite openly about how the main advantage was to increase profit margins by speeding up production.
  11. ^ Doward, Jamie (2019-03-23). "Revealed: no need to add cancer-risk nitrites to ham". The Observer. London. Archived from the original on 2021-01-26. Retrieved 2021-02-14. The results show that there is no change in levels of inoculated C. botulinum over the curing process, which implies that the action of nitrite during curing is not toxic to C. botulinum spores at levels of 150ppm [parts per million] ingoing nitrite and below.
  12. ^ "Health | Too much bacon 'bad for lungs'". BBC News. 2007-04-17. Retrieved 2010-07-16.
  13. ^ Food Preservatives: Sodium nitrite FDA: Code of Federal Regulations, 21 (3): 21CFR172.175. Revised 1 April 2011.

References

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  • McGee, Harold. On Food and Cooking (revised). New York, NY: Scribner, 2004. ISBN 0-684-80001-2
  • Bertolli, Paul. Cooking by Hand. New York, NY: Clarkson Potter/Publishers, 2003. ISBN 0-609-60893-2
  • National Research Council Academy of Life Sciences. "The Health Effects of Nitrate, Nitrite and N-Nitroso Compounds". Washington DC: National Academy Press, 1981.
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