AquAdvantage salmon

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AquAdvantage salmon is a genetically modified (GM) Atlantic salmon developed by AquaBounty Technologies. A growth hormone-regulating gene from a Pacific Chinook salmon, with a promoter from an ocean pout, was added to the Atlantic salmon's 40,000 genes. This gene enables it to grow year-round instead of only during spring and summer. The purpose of the modifications is to increase the speed at which the fish grows without affecting its ultimate size or other qualities. The fish grows to market size in 16 to 18 months rather than three years.[1] The latter figure refers to varieties whose growth rate has already been improved by 2:1 as a result of traditional selective breeding. Conventional salmon growers publicly challenged the claimed growth rates.[2]

Genetic modification

AquAdvantage salmon are triploid (having three sets of chromosomes whereas most animals have two sets) female Atlantic salmon (Salmo salar), with a single copy of the opAFP-GHc2 construct, which codes for a promoter sequence from ocean pout directing production of a growth hormone protein using coding sequence from Chinook salmon.[3]:vii, 8 This transgene allows the fish to achieve accelerated growth rates.[4] Induction of triploidy in nearly 99% of the salmon by treatment of batches of eggs renders most of the fish sterile, reducing the risk of interbreeding with wild-type fish and further increasing growth by removing the stress of reproduction.[5]


AquAdvantage built a 100-ton/year aquaculture facility in landlocked highlands in Panama, a fraction of the 1.6 million ton/year[6] global output of farmed Atlantic salmon. The company promoted its product as a way to re-establish a domestic U.S. salmon industry in place of imported aquaculture fish from Chile and Norway, reducing transportation costs and carbon footprint.[7]


Commercial aquaculture is the most rapidly growing segment of the agricultural industry, accounting for more than 60 million tons in 2012, versus 90 million tons of wild-caught fish. That year, aquaculture output exceeded beef output for the first time. While land-based agriculture is increasing between 2% and 3% per year, aquaculture has been growing at an average rate around 9% per year since 1970. As of 2011, salmon aquaculture produced 1.9 million tons of fish.[8]


Aquaculture that uses conventionally bred salmon, mostly Atlantic salmon, cultivates the fish in net pens. In North America, this occurs mostly in coastal waters off Washington, British Columbia, and Maine. However, the application for FDA approval of AquAdvantage salmon specified land-based tank cultivation with no ocean involvement.[9]

Critics raised concerns about potential environmental impacts if these fish reached rivers or oceans. Modeled invasion scenarios in semi-natural environments suggest that GM salmon would outcompete wild-type salmon.[10][11][12][13] However, William Muir, the researcher who developed the "Trojan gene" hypothesis frequently cited by critics of this salmon, has discounted this scenario, noting their "sin of omission" and describing it as an "urban myth".[14] His analysis indicates that "the data conclusively shows that there is no Trojan Gene effect as expected. The data in fact suggest that the transgene will be purged by natural selection. In other words the risk of harm here is low.”[14]

Whole Foods, Trader Joe's, Aldi, and other grocery stores throughout the United States have announced that they would not offer AquAdvantage.[15]

 Wild-type Atlantic salmon (Salmo salar).
Wild-type Atlantic salmon (Salmo salar)

Survival in new habitats

Fish can learn to feed on new prey after leaving hatchery environments. These adaptations could pose a risk if GM salmon were to be released into the wild.[16]

The ability of GM salmon to grow faster does not necessarily mean they are preferentially preyed upon, and this leads to increased survival.[vague] In a competition scenario, such as a release of GM fish from a salmon farm into the wild, the GM salmon could initially outcompete wild-type salmon for food.[citation needed] This success would allow the GM salmon's greater survival.[10][16]

Rate of growth

AquAdvantage salmon have the potential to feed more efficiently than wild-type salmon. This leads to an accelerated growth rate during their first year after hatching. These fish have the capability to grow 11 times faster than wild-type salmon. This characteristic allows GM salmon to mature more rapidly and gives them the ability to reproduce in less than two years (about 700 days).[17][10] However, studies suggest this accelerated maturity of GM salmon does not provide a reproduction advantage over wild-type.[17]


Smoltification is the process of salmon adapting from freshwater to marine water. GM salmon can potentially achieve smolt size in only one year. This could allow AquAdvantage fish to reach the ocean quicker. The ability to reach the ocean first could allow GM salmon to access more food with less competition from wild-type salmon.[11]


Fish are one of the eight food types that the FDA is required by law to treat with special care, with regard to allergies.[3]:97 As part of the regulatory process, the FDA required data on whether changes occur in the kinds or levels of fish allergens (such as parvalbumin) in AquAdvantage. The FDA reviewed data from the company and concluded, "The allergenic potency of triploid ABT salmon was not significantly different from that of sponsor control diploid salmon."[3]:104

Swimming capabilities

AquAdvantage salmon lack in swimming capabilities compared to wild-type salmon.[17][11][12][18] AquAdvantage individuals consume more energy when swimming than wild-type salmon. This is most likely due to the type of muscle fibers. AquAdvantage fish's muscle fibers have a smaller diameter than wild-type salmon. Because the force a muscle generates is proportional to its diameter, the smaller muscle diameter of AquAdvantage salmon produces less force than the wild-type.[18]

Reproductive competition

Under simulated models, both precocial parr and anadromous GM male salmon lack reproductive success and have a reduced number of surviving offspring. GM salmon's lack of fertilization success can be attributed to nest fidelity, quivering frequency, and spawn participation.[11] Under simulated competition environments, 94% of siring occurred by wild-type salmon, while only 5.4% was attributed to GM salmon.[17] This advantage allows more than twice as many wild-type offspring to be produced.[17] Other characteristics that could cause wild-type males to be chosen more frequently could be the lack of growth of the kype, the hooked jaw of a male, and red coloration on anadromous males, which demonstrates sexual maturity to females.

Using in vitro analysis, GM salmon's ejaculate was much less concentrated and had a lower sperm count and decreased sperm velocity, all of which can decrease GM salmon's fertilization success.[17]


AquaBounty addresses these concerns by cultivating reproductively incapable females. Most escapees cannot reproduce either natively or by interbreeding with wild stocks, because treatments of eggs have been found to render 98.9% of them triploid; batches with more than 5% diploid individuals will be destroyed.[5][19] The company plans to provide farmers with fish rather than eggs,[1] and has proposed that AquAdvantage fish only be raised in land-based facilities.[20]

Government regulation

United States

In September 2010, an FDA advisory panel indicated that the fish is "highly unlikely to cause any significant effects on the environment" and that it is "as safe as food from conventional Atlantic salmon"[3][21] Kathleen Jones of the FDA's Center for Veterinary Medicine said:

In conclusion, all of the data and information we reviewed ... really drive us to the conclusion that AquAdvantage salmon is Atlantic salmon, and food from AquAdvantage salmon is as safe as food from other Atlantic salmon.[22]

In October 2010, 39 lawmakers asked the FDA to reject the application. Other groups requested that the fish carry a label identifying its transgenic origin.[21] Concerns included alleged flaws in sterilization and isolation, and excessive antibiotic use.[23] In 2012, the major shareholder of AquaBounty Technologies said that he doubted that approval would be granted for the AquAdvantage salmon in a US election year.[24]

On 25 December 2012, the FDA published a draft environmental assessment for AquAdvantage salmon.[4] The FDA also published a preliminary Finding of No Significant Impact.[25] A 60-day period for the public to comment was to elapse before the FDA reviewed Aquadvantage salmon again, which was arbitrarily extended until May 2013.[26][27] As of May 2013, the public comment period officially ended, and the FDA was then scheduled to finalize its assessment.[15]

The Food and Drug Administration (FDA) approved AquaBounty Technologies' application to sell the AquAdvantage salmon to U.S. consumers on November 19, 2015.,[28] However, a rider to a spending bill signed into law on December 18, 2015 by President Obama bans its import until the FDA mandates labels for the genetically modified product.[29][30] The decision marks the first time a genetically modified animal has been approved to enter the United States food supply. The decision came nearly twenty years after the company first submitted data to the FDA, and after they had raised ten generations of the animals. [23] The announcement released by the FDA states: "AquAdvantage salmon is as safe to eat as any non-genetically engineered (GE) Atlantic salmon, and also as nutritious." [31][32] One month later, language was introduced into a proposed federal spending bill requiring consumer notification that the fish is genetically modified.[33]


On 25 November 2013, Environment Canada approved the product for salmon egg production for commercial purposes in Canada.[34]

In May 2016, the Canadian Food Inspection Agency approved the sale of the GM fish.[35] In July 2017, AquaBounty Technologies said they had sold 4.5 tons of AquaAdvantage salmon fillets to customers in Canada.[36][37]


  1. ^ a b Blumenthal 2010
  2. ^ Salmobreed 2011.
  3. ^ a b c d FDA 2010.
  4. ^ a b FDA & December 2012.
  5. ^ a b Anastasia Bodnar (October 2010). "Risk Assessment and Mitigation of AquAdvantage Salmon" (PDF). ISB News Report. 
  6. ^ "Learn More About Farmed Salmon and the Salmon Farming Industry". 9 August 2013. 
  7. ^ "FDA Considers Genetically Engineered Salmon". 21 September 2010. 
  8. ^ FAO 2012, p. 21.
  9. ^ von Mogel, Karl Haro (24 April 2013). "Interview with Ron Stotish at BIO". 
  10. ^ a b c Sundström & Devlin 2010, pp. 447–460.
  11. ^ a b c d Moreau, Conway & Fleming 2011, pp. 736–748.
  12. ^ a b Hu & Zhu 2010, pp. 401–408.
  13. ^ Ahrens & Devlin 2010, pp. 583–597.
  14. ^ a b Zajac, Andy (November 26, 2010). "Foes of GE salmon raise specter of 'Trojan gene' effect". Los Angeles Times. 
  15. ^ a b Ledford 2013.
  16. ^ a b Sundström et al. 2009, pp. 762–769.
  17. ^ a b c d e f Fitzpatrick et al. 2011, pp. 185–191.
  18. ^ a b et al. 2003, pp. 753–766.
  19. ^ Ron 2010
  20. ^ "Is Genetically Modified Salmon Safe?". Discovery News. February 11, 2013. Retrieved 2013-05-08. 
  21. ^ a b Mundy & Tomson 2010
  22. ^ Carollo 2010
  23. ^ a b Naik 2010.
  24. ^ Pollack 2012.
  25. ^ FDA & May 2012.
  26. ^ Federal Register 2012.
  27. ^ Reardon 2012.
  29. ^ Dennis, Brady (29 January 2016). "FDA bans imports of genetically engineered salmon — for now". Washington Post. Retrieved 9 April 2016. 
  30. ^ FDA. FDA Import Alert 99-40 "GENETICALLY ENGINEERED (GE) SALMON" (01/29/2016).
  31. ^ FDA. "FDA Has Determined That the AquAdvantage Salmon is as Safe to Eat as Non-GE Salmon". Retrieved 19 November 2015. 
  32. ^ Steenhuysen, Julie; Polansek, Tom (19 November 2015). "U.S. clears genetically modified salmon for human consumption". Reuters. Retrieved 9 April 2016. 
  33. ^ Dennis, Brady (17 December 2015). "FDA must develop plan to label genetically engineered salmon, Congress says". The Washington Post. The Washington Post. Retrieved 6 April 2016. 
  35. ^ "Canada Approves Sale of Genetically Modified Salmon". 
  36. ^ Coghlan, Andy (2017-08-08). "Genetically engineered salmon goes on sale for the first time". New Scientist. Retrieved 2017-08-08. 
  37. ^ Waltz,Nature, Emily. "First Genetically Engineered Salmon Sold in Canada". Scientific American. Retrieved 2017-08-08. 


  • Ahrens, Robert N. M.; Devlin, Robert H. (2010). "Standing genetic variation and compensatory evolution in transgenic organisms: A growth-enhanced salmon simulation". Transgenic Research. 20 (3): 583–97. doi:10.1007/s11248-010-9443-0. PMC 3090570Freely accessible. PMID 20878546. 
  • Blumenthal, Les (August 2, 2010). "Company says FDA is nearing decision on genetically engineered Atlantic salmon". The Washington Post. Retrieved 2 August 2010. 
  • Carollo, Kim (20 September 2010). "Surprise: FDA Panel Unable to Reach Conclusion on Genetically Modified Salmon Public Hearing Concludes, No Vote or Recommendation by FDA". ABC News. Retrieved 1 October 2010. 
  • Doward, Jamie (September 26, 2010). "GM food battle moves to fish as super-salmon nears US approval". The Guardian. Retrieved 1 October 2010. 
  • Fitzpatrick, John L.; Akbarashandiz, Hamid; Sakhrani, Dionne; Biagi, Carlo A.; Pitcher, Trevor E.; Devlin, Robert H. (2011). "Cultured growth hormone transgenic salmon are reproductively out-competed by wild-reared salmon in semi-natural mating arenas". Aquaculture. 312 (1–4): 185–91. doi:10.1016/j.aquaculture.2010.11.044. 
  • Hedlund, Steven (25 May 2012). "Measure requiring GM salmon study rejected". Seafood Source. Retrieved 3 October 2012. 
  • Ledford, Heidi (2013). "Transgenic salmon nears approval". Nature. 497 (7447): 17–8. doi:10.1038/497017a. PMID 23636372. 
  • Lee, C. G.; Devlin, R. H.; Farrell, A. P. (2003). "Swimming performance, oxygen consumption and excess post-exercise oxygen consumption in adult transgenic and ocean-ranched coho salmon". Journal of Fish Biology. 62 (4): 753–66. doi:10.1046/j.1095-8649.2003.00057.x. 
  • Moreau, Darek T. R.; Conway, Corinne; Fleming, Ian A. (2011). "Reproductive performance of alternative male phenotypes of growth hormone transgenic Atlantic salmon (Salmo salar)". Evolutionary Applications. 4 (6): 736–48. doi:10.1111/j.1752-4571.2011.00196.x. PMC 3352541Freely accessible. PMID 25568019. 
  • Mundy, Alicia; Tomson, Bill (1 October 2010). "Industry Fights Altered Salmon". The Wall Street Journal. Retrieved 5 November 2016. 
  • Naik, Gautam (September 21, 2010). "Gene-Altered Fish Closer to Approval". The Wall Street Journal. 
  • Pollack, Andrew (21 May 2012). "An Entrepreneur Bankrolls a Genetically Engineered Salmon". The New York Times. Retrieved 3 October 2012. 
  • Reardon, Sarah (28 December 2012). "Approval for gene-modified salmon spawns controversy". New Scientist. Retrieved 2 January 2013. 
  • Ron, Benny (November 23, 2010). "Genetically Engineered Salmon Eggs Designed to Grow on Land". Archived from the original on 26 December 2010. 
  • Sundström, L. Fredrik; Devlin, Robert H. (2010). "Increased intrinsic growth rate is advantageous even under ecologically stressful conditions in coho salmon (Oncorhynchus kisutch)". Evolutionary Ecology. 25 (2): 447–60. doi:10.1007/s10682-010-9406-1. 
  • Sundström, L. Fredrik; Tymchuk, Wendy E.; Lõhmus, Mare; Devlin, Robert H. (2009). "Sustained predation effects of hatchery-reared transgenic coho salmon Oncorhynchus kisutch in semi-natural environments". Journal of Applied Ecology. 46 (4): 762–9. doi:10.1111/j.1365-2664.2009.01668.x. 
  • Hu, Wei; Zhu, Zuoyan (2010). "Integration mechanisms of transgenes and population fitness of GH transgenic fish". Science China Life Sciences. 53 (4): 401–8. doi:10.1007/s11427-010-0088-2. PMID 20596905. 
  • "Briefing Packet: AquAdvantage Salmon" (PDF). Food and Drug Administration Center for Veterinary Medicine. 20 September 2010. 
  • "Draft Environmental Assessment and Preliminary Finding of No Significant Impact Concerning a Genetically Engineered Atlantic Salmon" (PDF). Federal Register. 26 December 2012. Retrieved 2 January 2013. 
  • "Environmental Assessment for AquAdvantage Salmon" (PDF). United States Food and Drug Administration. 25 December 2012. Retrieved 2 January 2013. 
  • "Preliminary Finding of No Significant Impact AquAdvantage Salmon" (PDF). United States Food and Drug Administration Department of Health and Human Services. 4 May 2012. Retrieved 2 January 2013. 
  • "Salmobreed challenges GMO Salmon" (PDF) (Press release). Salmobreed. November 2011. Retrieved 2013-01-18. 
  • Obama administration 'bailed out' GM salmon firm, The Guardian, 18 October 2011
  • Stefano B. Longo, Rebecca Clausen and Brett Clark, Capitalism and the Commodification of Salmon, Monthly Review, 2014, Volume 66, Issue 07 (December)

External links

  • AquaBounty site
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