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Tilapia

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This article is about the fish that fall under the term tilapia in common usage. For species belonging to the genus Tilapia, see Tilapia (genus).
Nile tilapia, Oreochromis niloticus
Global harvest of tilapia in million tonnes as reported by the FAO, 19502009[1]

Tilapia (/tlpi/ ti-LAH-pee-) is the common name for nearly a hundred species of cichlid fish from the tilapiine cichlid tribe. Tilapia are mainly freshwater fish inhabiting shallow streams, ponds, rivers and lakes and less commonly found living in brackish water. Historically, they have been of major importance in artisan fishing in Africa and the Levant and are of increasing importance in aquaculture and aquaponics. Tilapia can become problematic invasive species in new warm-water habitats such as Australia,[2] whether deliberately or accidentally introduced, but generally not in temperate climates due to their inability to survive in waters cooler than about 21 °C (70 °F).

History

The Tomb of Nakht, 1500 BC, contains a tilapia hieroglyph just above the head of the central figure.
Tilapia go by many names. The aquaculture of Nile tilapia goes back to Ancient Egypt, where it was represented by the hieroglyph K1,
K1
of the Gardiner List.

Tilapia were one of the three main types of fish caught in Biblical times from the Sea of Galilee. At that time they were called musht, or commonly now even "St. Peter's fish". The name "St. Peter's fish" comes from the story in the Gospel of Matthew about the apostle Peter catching a fish that carried a coin in its mouth, though the passage does not name the fish.[3] While the name also applies to Zeus faber, a marine fish not found in the area, a few tilapia species (Sarotherodon galilaeus galilaeus and others) are found in the Sea of Galilee, where the author of the Gospel of Matthew recounts the event took place. These species have been the target of small-scale artisanal fisheries in the area for thousands of years.[4][5]

The common name tilapia is based on the name of the cichlid genus Tilapia, which is itself a latinisation of thiape, the Tswana word for "fish".[6]Scottish zoologist Andrew Smith named the genus in 1840.[7]

Characteristics

Nile tilapia, Oreochromis niloticus

Tilapia typically have laterally compressed, deep bodies. Like other cichlids, their lower pharyngeal bones are fused into a single tooth-bearing structure. A complex set of muscles allows the upper and lower pharyngeal bones to be used as a second set of jaws for processing food (cf. morays), allowing a division of labor between the "true jaws" (mandibles) and the "pharyngeal jaws". This means they are efficient feeders that can capture and process a wide variety of food items.[8] Their mouths are protrusible, usually bordered with wide and often swollen lips. The jaws have conical teeth. Typically tilapia have a long dorsal fin, and a lateral line which often breaks towards the end of the dorsal fin, and starts again two or three rows of scales below.

Other than their temperature sensitivity, tilapia exist in or can adapt to a very wide range of conditions. One extreme example is the Salton Sea, where tilapia introduced when the water was brackish now live in saltwater so salty that it kills marine fish.[9]

Species

Tilapia as a common name has been applied to various cichlids from three distinct genera: Oreochromis,[10]Sarotherodon[11] and Tilapia.[12] The members of the other two genera used to belong to the genus Tilapia but have since been split off into their own genera. However, particular species within are still commonly called "tilapia" regardless of the change in their actual taxonomic nomenclature.

The delimitation of these genera among each other and to other tilapiines requires more research; mtDNA sequences are confounded because at least among the species of any one genus, there is frequent hybridization. The species remaining in Tilapia in particular still seem to be a paraphyletic assemblage.[13]

Exotic and invasive species

See also: Tilapia as exotic species

Tilapia has been used as biological controls for certain aquatic plant problems. It has a preference for a floating aquatic plant, duckweed (Lemna sp.) but also consume some filamentous algae.[14] In Kenya tilapia were introduced to control mosquitoes which were causing malaria, because they consume mosquito larvae, consequently reducing the numbers of adult female mosquitoes, the vector of the disease (Petr 2000). These benefits are, however, frequently outweighed by the negative aspects of tilapia as an invasive species.[citation needed]

Tilapia are unable to survive in temperate climates because they require warm water. The pure strain of the blue tilapia, Oreochromis aureus, has the greatest cold tolerance and dies at 45 °F (7 °C), while all other species of tilapia will die at a range of 52 to 62 °F (11 to 17 °C). As a result, they cannot invade temperate habitats and disrupt native ecologies in temperate zones; however, they have spread widely beyond their points of introduction in many fresh and brackish tropical and subtropical habitats, often disrupting native species significantly.[15] Because of this, tilapia are on the IUCN's 100 of the World's Worst Alien Invasive Species list.[16] In the United States, tilapia are found in much of the south, especially Florida, Texas, as well as far North as Idaho where they survive in power plant discharge zones.[17] Tilapia are also currently stocked in the Phoenix, Arizona canal system as an algae growth control measure. Many state fish and wildlife agencies in the United States, Australia, South Africa, and elsewhere consider them to be invasive species.[18]

Aquarium species

Larger tilapia species are generally poor community aquarium fish because they eat plants, dig up the bottom, and fight with other fish. However, the larger species are often raised in aquariums as a food source, because they grow rapidly and tolerate high stocking densities and poor water quality.

Smaller West African species, such as Tilapia joka and species from the crater lakes of Cameroon, are more popular. In specialised cichlid aquaria, tilapia can be mixed successfully with nonterritorial cichlids, armored catfish, tinfoil barbs, garpike and other robust and dangerous fish. Some species, including Tilapia buttikoferi, Tilapia rendalli,Tilapia mariae, Tilapia joka and the brackish-water Sarotherodon melanotheron melanotheron, have attractive patterns and are quite decorative.[19]

This article is
one of a series on
Commercial fish
Blue walleye.jpg
Large pelagic
billfish, bonito
mackerel, salmon
shark, tuna

Forage
anchovy, herring
menhaden, sardine
shad, sprat

Demersal
cod, eel, flatfish
pollock, ray
Mixed
carp, tilapia

Commercial species

The tilapiines of North Africa are the most important commercial cichlids. Fast-growing, tolerant of stocking density, and adaptable, they have been introduced to and are farmed extensively in many parts of Asia and are increasingly common aquaculture targets elsewhere.

Principal commercial tilapia species
Common nameScientific nameMaximum
length
Common
length
Maximum
weight
Maximum
age
Trophic
level
Fish
Base
FAOWoRMSIUCN status
Nile tilapiaOreochromis niloticus (Linnaeus, 1758)60 cmcm4.324 kg9 years2.0[20][21][22][23]Not assessed
Blue tilapia    - Oreochromis aureus
      (Steindachner, 1864)
45.7 cm16 cm2.010 kgyears2.1[24][25]LC IUCN 3 1.svg Least concern[26]
Nile tilapia + blue tilapia hybridcmcmkgyears
Mozambique tilapiaOreochromis mossambicus (Peters, 1852)39 cm35 cm1.130 kg11 years2.0[27][28][29]NT IUCN 3 1.svg Near threatened[30]
Global harvest of tilapia species in million tonnes
as reported by the FAO, 19502009 [1]
 Wild capture
 Aquaculture production

Wild species

Aquaculture

Main article: Aquaculture of tilapia
Red nile tilapia under experimentation in CLSU, Philippines

Farmed tilapia production is about 1,500,000 tonnes (1,500,000 long tons; 1,700,000 short tons) annually with an estimated value of US$1.8 billion,[31] about equal to that of salmon and trout.

Unlike carnivorous fish, tilapia can feed on algae or any plant-based food. This reduces the cost of tilapia farming, reduces fishing pressure on prey species, avoids concentrating toxins that accumulate at higher levels of the food chain and makes tilapia the preferred "aquatic chickens" of the trade.[32]

Because of their large size, rapid growth, and palatability, tilapiine cichlids are the focus of major farming efforts, specifically various species of Oreochromis, Sarotherodon, and Tilapia, collectively known colloquially as tilapia. Like other large fish, they are a good source of protein and popular among artisanal and commercial fisheries. Most such fisheries were originally found in Africa, but outdoor fish farms in tropical countries, such as Papua New Guinea, the Philippines, and Indonesia, are underway in freshwater lakes.[33] In temperate zone localities, tilapiine farming operations require energy to warm the water to tropical temperatures. One method uses waste heat from factories and power stations.[34]

China is the largest tilapia producer in the world, followed by Egypt.[35]

In modern aquaculture, wild-type Nile tilapia are not too often seen, as the dark color of their flesh is not much desired by many customers, and because it has a bit of a reputation of being a trash fish associated with poverty.[36] On the other hand, they are fast-growing and give good fillets; leucistic ("Red") breeds which have lighter meat have been developed and these are very popular.

Hybrid stock is also used in aquaculture; Nile × blue tilapia hybrids are usually rather dark, but a light-colored hybrid breed known as "Rocky Mountain White" tilapia is often grown due to its very light flesh and tolerance of low temperatures.[36]

Commercially grown tilapia are almost exclusively male. Cultivators use hormones, such as testosterone, to reverse the sex of newly spawned females. Because tilapia are prolific breeders, the presence of female tilapia results in rapidly increasing populations of small fish, rather than a stable population of harvest-size animals.[37]

Other methods of tilapia population control are polyculture, with predators farmed alongside tilapia or hybridization with other species.[38]

As food

Escabeche fresh tilapia
Redbelly tilapia, Tilapia zilli ("St. Peter's fish") served in a Tiberias restaurant

Whole tilapia fish can be processed[39] into skinless, boneless (Pin-Bone Out, or PBO) fillets: the yield is from 30 percent to 37 percent, depending on fillet size and final trim.[40][41] The use of tilapia in the commercial food industry has led to the virtual extinction of genetically pure bloodlines.[citation needed] Most wild tilapia today are hybrids of several species.

Tilapia is one of several commercially important aquaculture species (including trout, barramundi and channel catfish) susceptible to off-flavours. These 'muddy' or 'musty' flavours are normally caused by geosmin and 2-Methylisoborneol, organic products of ubiquitous cyanobacteria that are often present or bloom sporadically in water bodies and soil.[42] These flavours are no indication of freshness or safety of the fish, but can harm the reputation of a product in the eyes of the consumer. Simple quality control procedures are known to be effective in ensuring the quality of fish entering the market.

Tilapia have very low levels of mercury,[43] as they are fast-growing, lean and short-lived, with a primarily vegetarian diet, so do not accumulate mercury found in prey.[44] Tilapia are low in saturated fat, calories, carbohydrates and sodium, and are a good protein source. They also contain the micronutrients phosphorus, niacin, selenium, vitamin B12 and potassium.[45]

The lower amounts of omega-3 and the higher ratios of omega-6 fats in US-farmed tilapia raised questions about the health benefits of consuming farmed tilapia fish. Some media reports even controversially suggested that farm-raised tilapia may be worse for the heart than eating bacon or a hamburger.[46] This prompted the release of an open letter, signed by 16 science and health experts from around the world, that stated that both oily (i.e. high in omega-3 fatty acids) fish and lean fish like tilapia are an important part of the diet and concluded that "replacing tilapia or catfish with 'bacon, hamburgers or doughnuts' is absolutely not recommended."[47]

Multiple studies have evaluated the effects of adding flaxseed derivatives (a vegetable source of omega-3 fatty acids) to the feed of farmed tilapia. These studies have found both the more common omega-3 fatty acid found in the flax, ALA and the two types almost unique to animal sources (DHA and EPA), increased in the fish fed this diet.[48][49] Guided by these findings, tilapia farming techniques could be adjusted to address the nutritional criticisms directed at the fish while retaining its advantage as an omnivore capable of feeding on economically and environmentally inexpensive vegetable protein. Adequate diets for salmon and other carnivorous fish can alternatively be formulated from protein sources such as soybean, although soy-based diets may also change in the balance between omega-6 and omega-3 fatty acids.[50]

More recent studies have called into question the value of omega-3 fatty acids relative to omega-6 fatty acids; several randomized controlled trials failed to show that omega-6 fatty acids caused an increase in heart disease,[51][52][53] while a study involving 70,000 patients in Greece found administering omega-3 supplements provided no health benefits.[54]

The US produced 1.5 million tons of tilapia in 2005, with 2.5 million projected by 2010.[55]

Miscellaneous uses

File:Fish types - Tamil Nadu210.ogvPlay media
Tilapia, young and mature, of Tamil Nadu

Tilapia serve as a natural, biological control for most aquatic plant problems. Tilapia consume floating aquatic plants, such as duckweed watermeal (Lemna sp.), most "undesirable" submerged plants, and most forms of algae.[56] In the United States and countries such as Thailand, they are becoming the plant control method of choice, reducing or eliminating the use of toxic chemicals and heavy metal-based algaecides.

Tilapia rarely compete with other "pond" fish for food. Instead, because they consume plants and nutrients unused by other fish species and substantially reduce oxygen-depleting detritus; adding tilapia often increases the population, size and health of other fish. They are used for zoo ponds as a source of food for birds.

Arizona stocks tilapia in the canals that serve as the drinking water sources for the cities of Phoenix, Mesa and others. The fish help purify the water by consuming vegetation and detritus, greatly reducing purification costs.

Arkansas stocks many public ponds and lakes to help with vegetation control, favoring tilapia as a robust forage species and for anglers.

In Kenya, tilapia help control mosquitoes which carry malaria parasites. They consume mosquito larvae, which reduces the numbers of adult females, the diseases vector.[57]

Tilapia also provide an abundant food source for aquatic predators.

See also

  • Tilapia in aquaculture

References

  1. ^ a b "Fisheries and Aquaculture Department Statistics". Food and Agriculture Organization of the United Nations. Retrieved 2012-09-15. 
  2. ^ "Tilapia". Department of Agriculture, Fisheries and Forestry. 
  3. ^ Matthew 17:2427
  4. ^ Baker, Jenny (1988). Simply Fish. London: Faber & Faber. p. 197. ISBN 0-571-14966-9. 
  5. ^ Rosencrans, Joyce (2003-07-16). "Tilapia is a farmed fish of biblical fame". The Cincinnati Post (E. W. Scripps Company). Archived from the original on 2006-02-18. Retrieved 2012-09-15. 
  6. ^ Chapman, Frank A. (July 1992). "Culture of Hybrid Tilapia: A Reference Profile". Circular 1051. University of Florida, Institute of Food and Agricultural Sciences. Retrieved 2007-08-17. 
  7. ^ "Genera Summary: Tilapia". Catalog of Fish - W.N. Eschmeyer; California Academy of Sciences. FishBase. June 2007. Retrieved 2007-08-17. [dead link]
  8. ^ Loiselle, P.V. (1994). The Cichlid Aquarium. Tetra Press. ISBN 1-56465-146-0. 
  9. ^ Science and the CSU
    The Salton Sea: Fishing for Answers
    A half-century later, a few species of fish have been hearty enough to survive. One of them is the tilapia and its key to the survival of the Saltons ecosystem, which includes millions of birds that depend on them for food...

    The salinity level of the Salton Sea is about 45 parts per thousand (ppt), which is about 30 percent saltier than the ocean"

  10. ^ "Oreochromis". Integrated Taxonomic Information System. 
  11. ^ "Sarotherodon". Integrated Taxonomic Information System. 
  12. ^ "Tilapia". Integrated Taxonomic Information System. 
  13. ^ Nagl, Sandra; Herbet Tichy, Werner E. Mayer, Irene E. Samonte, Brendan J. McAndrew & Jan Klein (2001). "Classification and Phylogenetic Relationships of African Tilapiine Fishes Inferred from Mitochondrial DNA Sequences". Molecular Phylogenetics and Evolution 20 (3): 361374. doi:10.1006/mpev.2001.0979. 
  14. ^ John W. Cross (2013-08-13). "Aquatic Weed Control". Mobot.org. Retrieved 2013-09-14. 
  15. ^ "Global Invasive Species Programme, Invasive Species Information, Tilapia". Retrieved 2012-09-15. 
  16. ^ "100 of the World's Worst Alien Invasive Species". Invasive Species Specialist Group. IUCN Species Survival Commission. Retrieved 2012-09-15. 
  17. ^ "NAS - Nonindigenous Aquatic Species". USGS. Retrieved 10 June 2014. 
  18. ^ "Oreochromis mossambicus (fish)". Global Invasive Species Database. IUCN Species Survival Commission. Retrieved 2012-09-15. 
  19. ^ "Keeping Tilapia in Aquariums". Tilapia. AC Tropical Fish. 2008. Retrieved 2009-01-19. 
  20. ^ Froese, Rainer and Pauly, Daniel, eds. (2012). "Oreochromis niloticus" in FishBase. September 2012 version.
  21. ^ "Oreochromis niloticus Linnaeus, 1758)". Species Fact Sheet. Food and Agriculture Organization of the United Nations. Retrieved 2012-09-15. 
  22. ^ "Oreochromis niloticus". Cultured Aquatic Species. Food and Agriculture Organization of the United Nations, Rome. Retrieved 2012-09-15. 
  23. ^ WoRMS. "Oreochromis niloticus". World Register of Marine Species. Retrieved 2012-09-15. 
  24. ^ Froese, Rainer and Pauly, Daniel, eds. (2012). "Oreochromis aureus" in FishBase. September 2012 version.
  25. ^ WoRMS. "Oreochromis aureus". World Register of Marine Species. Retrieved September 2012. 
  26. ^ Herdson D and Priede I (2011). "Oreochromis mossambicus". IUCN Red List of Threatened Species. Version 2011.2. International Union for Conservation of Nature. Retrieved September 2012. 
  27. ^ Froese, Rainer and Pauly, Daniel, eds. (2012). "Oreochromis mossambicus" in FishBase. September 2012 version.
  28. ^ "Oreochromis mossambicus (Peters, 1852)". Species Fact Sheet. Food and Agriculture Organization of the United Nations. Retrieved 2012-09-15. 
  29. ^ WoRMS. accessdate= September 2012 "Oreochromis mossambicus (Peters, 1852)". World Register of Marine Species. 
  30. ^ Herdson D and Priede I (2011). "Oreochromis mossambicus". IUCN Red List of Threatened Species. Version 2011.2. International Union for Conservation of Nature. Retrieved September 2012. 
  31. ^ De Silva, S.S; Subasinghe, R.P.; Bartley, D.M.; Lowther, A. (2004). "Tilapias as Alien Aquatics in Asia and the Pacific: A Review". FAO Fisheries Technical Paper - No. 453. 
  32. ^ Barlow, G. W. (2000). The Cichlid Fishes. Cambridge, MA: Perseus Publishing. ISBN 0-7382-0376-9. 
  33. ^ 007/y5728e/y5728e05.htm "Title unknown". Food and Agriculture Organization of the United Nations. [dead link]
  34. ^ "GO FISH, Egyptian Style". Ag Innovation News (Agricultural Utilization Research Institute). [not in citation given]
  35. ^ "Finding more fish, between Egypt and Vietnam". eco-business.com. 28 October 2010. Retrieved 2012-09-15. 
  36. ^ a b "Tilapia Aquaculture". Miami Aqua-culture, Inc. Retrieved 2012-09-15. 
  37. ^ "Fact about Tilapia Fish (Oreochromis spp.)". Retrieved 2012-09-15. [unreliable source?]
  38. ^ Prein, M. H. (1993). "Multivariate Methods in Aquaculture Research: Case Studies of Tilapia in Experimental and Commercial Systems". Manilla: ICLARM. 
  39. ^ "Whole Fish to Fillet (HACCP procedures videos of Tilapia fillet processing". Retrieved 2012-09-15. [unreliable source?]
  40. ^ "Different Processing Styles of Tilapia Fillets". Retrieved 2012-09-15. [unreliable source?]
  41. ^ "Title unknown". Tropical Aquaculture Products, Inc. Retrieved 2012-09-15. [unreliable source?]
  42. ^ Robin, J. et al. (2006). Off flavour characterization and origin in French trout farming. Aquaculture, 260(1-4)
  43. ^ "Mercury Levels in Commercial Fish and Shellfish (19902010)". United States Food and Drug Administration. 26 May 2011. Retrieved 2012-05-17. 
  44. ^ "Nutritional Facts". Tropical Aquaculture Products, Inc. Retrieved 2012-05-17. [unreliable source?]
  45. ^ "Nutrition Facts and Analysis for Fish, tilapia, cooked, dry heat". Retrieved 2014-01-26. 
  46. ^ Katz, David (16 July 2008). "Tilapia's worse than bacon? Oh, please.". Shine. Yahoo!. Retrieved 2012-05-17. 
  47. ^ Harris, William (16 July 2008). "An Open Letter regarding recent reports that low-fat fish like tilapia are unhealthy". Sanford Health. Retrieved 2011-12-21. 
  48. ^ Shapira, N et al. (March 2009). "n-3 PUFA fortification of high n-6 PUFA farmed tilapia with linseed could significantly increase dietary contribution and support nutritional expectations of fish". J. Agric. Food Chem. 57: 22492254. doi:10.1021/jf8029258. PMID 19243170. (subscription required)
  49. ^ Aguiar, AC et al. (September 2007). "Effect of flaxseed oil in diet on fatty acid composition in the liver of Nile tilapia (Oreochromis niloticus)". Arch Latinoam Nutr. 57 (3): 273277. PMID 18271406. 
  50. ^ Espe, Marit et al. (May 2006). "Can Atlantic salmon (Salmo salar) grow on diets devoid of fish meal?". Aquaculture 255: 255262. doi:10.1016/j.aquaculture.2005.12.030. (subscription required)
  51. ^ Griffin BA (2008). "How relevant is the ratio of dietary omega-6 to omega-3 polyunsaturated fatty acids to cardiovascular disease risk? Evidence from the OPTILIP study". Current Opinion in Lipidology 19 (1): 5762. doi:10.1097/MOL.0b013e3282f2e2a8. PMID 18196988. 
  52. ^ Mozaffarian D, Ascherio A, Hu FB, Stampfer MJ, Willett WC, Siscovick DS, Rimm EB., D; Ascherio, A; Hu, FB; Stampfer, MJ; Willett, WC; Siscovick, DS; Rimm, EB (2005). "Interplay Between Different Polyunsaturated Fatty Acids and Risk of Coronary Heart Disease in Men". Circulation 111 (2): 15764. doi:10.1161/01.CIR.0000152099.87287.83. PMC 1201401. PMID 15630029. 
  53. ^ Willett WC, WC (2007). "The role of dietary n-6 fatty acids in the prevention of cardiovascular disease". J Cardiovasc Med 8: Suppl 1:S425. doi:10.2459/01.JCM.0000289275.72556.13. PMID 17876199. 
  54. ^ [1]
  55. ^ Wake Forest University Baptist Medical Center (2008, July 10).Popular Fish, Tilapia, Contains Potentially Dangerous Fatty Acid Combination. ScienceDaily. Retrieved July 11, 2008, from www.sciencedaily.com
  56. ^ Cross, John W., Ph.D. "Aquatic Weed Control". The Charms of Duckweed. Retrieved 2012-09-15. 
  57. ^ Petr, T (2000). "Interactions between fish and aquatic macrophytes in inland waters. A review.". FAO Fisheries Technical Papers 396. 

Further reading

  • Logan, Cheryl A.; Alter, S. Elizabeth; Haupt, Alison J.; Tomalty, Katharine; Palumbi, Stephen R. (2008). "An impediment to consumer choice: Overfished species are sold as Pacific red snapper". Biological Conservation 141 (6): 15911599. doi:10.1016/j.biocon.2008.04.007. ISSN 0006-3207. 
  • FAO Fishery Information, Data and Statistics Service (1993). "Aquaculture production (1985-1991)". FAO Fisheries Circular (Food and Agriculture Organization of the United Nations) 815: 2021. 
  • Trewavas, Ethelwynn (1983). Tilapiine fish of the genera Sarotherodon, Oreochromis and Danakilia. London: British Museum (Natural History). ISBN 0-565-00878-1. 
  • McCrary, Jeffrey K; Castro, Mark; McKaye, Kenneth R. (2005). "Mercury in Fish From Two Nicarguan Lakes: A Recommendation for Increased Monitoring of Fish for International Commerce" (PDF). Environmental Pollution 3 (141). pp. 513518. 

External links

  • Another Side of Tilapia, the Perfect Factory Fish New York Times article
  • How to Raise Tilapia in the Backyard
  • Tilapia Health, Diagnosis, and Treatment Advice
  • Tilapia Nutrition Information from USDA SR 22 database
  • Tilapia Nutrition Information
Retrieved from "http://en.wikipedia.org/w/index.php?title=Tilapia&oldid=655406472"

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Tilapia is a fish that is often farmed for food, or kept as pets in aquariums. They live in warm, fresh water, but some species live in brackish water. The fish are

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