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Canned fish

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File:Canned fish 2.JPG
Microbial loads can be minimized by canning and then sterilizing with heat

Canned fish are fish which have been processed, sealed in an airtight container such as a sealed tin can, and subjected to heat. Canning is a method of preserving food, and provides a typical shelf life ranging from one to five years.

Fish have a low acidity at levels where microbes can flourish. From a public safety point of view, foods with low acidity (a pH more than 4.6) need sterilization under high temperature (116–130°C). To achieve temperatures above the boiling point requires a method of pressurized cooking which is provided by the containment within the can.[1] After sterilization, the containing can prevents microorganisms from entering and proliferating inside. Other than sterilization, no method is perfectly dependable as a preservative. For example, the microorganism Clostridium botulinum (which causes botulism), can only be eliminated at temperatures above the boiling point.

Such preservation techniques are needed to prevent fish spoilage and lengthen shelf life. They are designed to inhibit the activity of spoilage bacteria and the metabolic changes that result in the loss of fish quality. Spoilage bacteria are the specific bacteria that produce the unpleasant odours and flavours associated with spoiled fish.[2][3]

Background

The "father of canning" is the Frenchman Nicolas Appert. In 1795, he began experimenting with ways to can fish in jars and then he placed the jars in boiling water.[4] During the first years of the Napoleonic Wars, the French government offered a 12,000 Franc prize to anyone who could devise a cheap and effective method of preserving large amounts of food. The larger armies of the period required increased and regular supplies of quality food. Appert submitted his invention and won the prize in January 1810. The reason for lack of spoilage was unknown at the time, since it would be another 50 years before Louis Pasteur demonstrated the role of microbes in food spoilage. However, glass containers presented challenges for transportation. Shortly after, the British inventor and merchant Peter Durand patented his own method, this time in a tin can, creating the modern-day process of canning foods.[5]

Canning was used in the 1830s in Scotland to keep fish fresh until it could be marketed. By the 1840s, salmon was being canned in Maine and New Brunswick.[6] The commercial salmon canneries had their main origins in California, and in the northwest of the US, particularly on the Columbia River. They were never important on the US Atlantic Coast, but by the 1940s, the principal canneries had shifted to Alaska.[7]

Just as using cans was a progression from using jars, a further recent progression is to use retortable pouches instead of cans.

Salmon

See also: Salmon cannery
The first industrial-scale fish cannery, a salmon cannery established in 1864 on a barge in the Sacramento River in California

A salmon cannery is a factory that commercially cans salmon. It is a fish processing industry that pioneered the practice of canning fish in general. It became established on the Pacific coast of North America during the nineteenth century, and subsequently expanded to other parts of the world that had easy access to salmon.

Prior to canning, fish were salted to preserve them. Cobb claims that at the start of the 19th century, the Russians marketed salted salmon caught in Alaska in St. Petersburg.[7][8] Shortly after, the Northwest Fur Company started marketing salted salmon from the Columbia River. It then merged with the Hudson's Bay Company, and the salmon was marketed in Australia, China, Hawaii, Japan and the eastern United States. Later, some salmon salteries were converted to salmon canneries.[7]

The first industrial scale salmon cannery in North America was established in 1864 on a barge in the Sacramento River by the four Hume brothers together with their partner Andrew S. Hapgood.[9] In 1866 the Hume brothers relocated the business to a site 50 miles inland on the Columbia River.[9] The history of North American salmon canneries is exemplified by their history on the Columbia River. Within a few years each of the Hume brothers had their own cannery. By 1872, Robert Hume was operating a number of canneries, bringing in Chinese people willing to work for low wages to do the cannery work, and having local Native American people do the fishing. By 1883, the salmon canneries had become the major industry on the Columbia River, with 1,700 gillnet boats supplying 39 canneries with 15,000 tonnes of salmon annually, mainly Chinook.[9]

Sardines

Unopened can of sardines
Canned sardines

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 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.[10] 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.[10]

Sardines are typically tightly packed in a small can which is scored for easy opening, either with a pull tab (similar to how a beverage can is opened), or a key, attached to the side of the can. Thus, it has the virtues of being an easily portable, nonperishable, self-contained food. The close packing of sardines in the can has led to their metaphorical use of the name in describing any situation where people or objects are crowded together, for instance, in a bus or subway car. It has also been used as the name of a children's game, where one person hides and each successive person who finds the hidden one packs into the same space until there is only one left out, who becomes the next one to hide.[11]

Tuna

Photo of grocery shelves
A large quantity of canned tuna for sale at a supermarket

Tuna is canned in edible vegetable oils, in brine, in water, or in various sauces. In the US, it is sometimes called tuna fish. In the United States, only albacore can legally be sold in canned form as "white meat tuna";[12] in other countries, yellowfin is also acceptable. While in the early 1980s, canned tuna in Australia was most likely Southern bluefin; as of 2003 it was usually yellowfin, skipjack, or tongol (labelled "Northern bluefin").[13]

As tunas are often caught far from where they are processed, poor interim conservation can lead to spoilage. Tuna is typically gutted by hand and later pre-cooked for prescribed times of perhaps 45 minutes to three hours. The fish are then cleaned and filleted, canned, and sealed, with the dark lateral blood meat often separately canned for pet food. The sealed can itself is then heated (called retort cooking) for 2 to 4 hours.[14] This process kills any bacteria but retains the histamine that can produce rancid flavors. The international standard sets the maximum histamine level at 200 milligrams per kilogram. An Australian study of 53 varieties of unflavored canned tuna found none to exceed the safe histamine level, although some had "off" flavors.[13] The level of omega-3 oils found in canned tuna can be highly variable, since some common manufacturing methods destroy omega-3 oils.[15]

Australian standards once required cans of tuna to contain at least 51% tuna, but these regulations were dropped in 2003.[16][17] The remaining weight is usually oil or water. In the US, the FDA regulates canned tuna (see part c).[18] In 2008, some tuna cans changed from 6 ounces (170 g) to 5 ounces (140 g) due to "higher tuna costs".[19] In the United States 52% of canned tuna is used for sandwiches, 22% for salads, and 15% for casseroles and dried, packaged meal mixes.[20]

Other

Other fish that is canned includes cod, mackerel, herring, and pilchard (a type of sardine).

Images

See also

References

  1. ^ William Schafer (2009-01-09). "Home Canning Tomatoes". Extension.umn.edu. Archived from the original on July 16, 2010. Retrieved 2010-07-14. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  2. ^ Huss HH (1988) Quality and quality changes in fresh fish FAO Fisheries Technical Paper 348, Rome. ISBN 92-5-103507-5.
  3. ^ FAO: Preservation techniques Fisheries and aquaculture department, Rome. Updated 27 May 2005. Retrieved 14 March 2011.
  4. ^ Lance Day, Ian McNeil, ed. (1996). Biographical Dictionary of the History of Technology. Routledge. ISBN 0-415-19399-0.
  5. ^ Klooster, John W (2009) Icons of invention: the makers of the modern world from Gutenberg to Gates p. 103, ABC-CLIO. ISBN 978-0-313-34745-0.
  6. ^ Newell, 1990, p. 4.
  7. ^ a b c Jarvis ND (1988) Curing and Canning of Fishery Products: A History Marine Fisheries Review, 50 (4): 180–185.
  8. ^ Cobb JN (1917) Pacific salmon fisheries. Government Printing Office, Bur. Fish., Doc 1092. 297 pages.
  9. ^ a b c Columbia River History: Canneries Northwest Power and Conservation Council. Retrieved 19 March 2012.
  10. ^ a b "Codex standard for canned sardines and sardine-type products codex stan 94 –1981 REV. 1-1995" (PDF). Codex Alimentarius. FAO/WHO Codex Alimentarius Commission. pp. 1–7. Retrieved 2007-01-18.
  11. ^ "Stinky Sardine Club". Archived from the original on 29 November 2014. Retrieved 25 November 2014. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  12. ^ Ellis, Richard. Tuna: A Love Story. New York: Random House, 2009, p. 119. ISBN 0-307-38710-0
  13. ^ a b Choice: Jan/Feb 2004.
  14. ^ "The tuna processing industry". US Dept. of Labor. Archived from the original on September 30, 2007. Retrieved 15 October 2007. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  15. ^ Is canned tuna a good source of omega 3 fats? WHFoods. Retrieved 22 September 2012.
  16. ^ Choice, August 2003.
  17. ^ "Compare products and find independent product reviews at choice.com.au". Retrieved 25 November 2014.
  18. ^ "CFR - Code of Federal Regulations Title 21". Accessdata.fda.gov. Retrieved 2010-09-22.
  19. ^ "FOOD IMPORT GROUP Market Flash: May 2008". Foodimportgroup.blogspot.com. 2008-05-22. Retrieved 2010-09-22.
  20. ^ "Tuna". Modern Marvels, 4 February 2010.
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