Navigation Links
Farm salmon pose clear reproductive threat to wild gene pools
Date:3/9/2014

Farmed salmon show full reproductive potential to invade wild gene pools and should be sterilised - according to new research from the University of East Anglia (UEA).

Findings published today reveal that, while farmed salmon are genetically different to their wild counterparts, they are just as fertile. This is important information because millions of farmed salmon escape into the wild posing threats to wild gene pools.

Lead Researcher Prof Matt Gage from UEA's school of Biological Sciences said: "Around 95 per cent of all salmon in existence are farmed, and domestication has made them very different to wild populations, each of which is locally adapted to its own river system.

"Farmed salmon grow very fast, are aggressive, and not as clever as wild salmon when it comes to dealing with predators. These domestic traits are good for producing fish for the table, but not for the stability of wild populations.

"The problem is that farmed salmon can escape each year in their millions, getting into wild spawning populations, where they can then reproduce and erode wild gene pools, introducing these negative traits.

"We know that recently-escaped farmed salmon are inferior to wild fish in reproduction, but we do not have detailed information on sperm and egg performance, which could have been affected by domestication. Our work shows that farm fish are as potent at the gamete level as wild fish, and if farm escapes can revive their spawning behaviour by a period in the wild, clearly pose a significant threat of hybridisation with wild populations."

Researchers used a range of in vitro fertilization tests in conditions that mimicked spawning in the natural environment, including tests of sperm competitiveness and egg compatibility. All tests on sperm and egg form and function showed that farmed salmon are as fertile as wild salmon identifying a clear threat of farmed salmon reproducing with wild fish.

"Some Norwegian rivers have recorded big numbers of farmed fish present as much as 50 per cent. Both anglers and conservationists are worried by farmed fish escapees which could disrupt locally adapted traits like timing of return, adult body size, and disease resistance.

"Salmon farming is a huge business in the UK, Norway and beyond, and while it does reduce the pressure on wild fish stocks, it can also create its own environmental pressures through genetic disruption.

"A viable solution is to induce 'triploidy' by pressure-treating salmon eggs just after fertilisation - where the fish grows as normal, but with both sex chromosomes; this is normal for farming rainbow trout. The resulting adult develops testes and ovaries but both are much reduced and most triploids are sterile. These triploid fish can't reproduce if they escape, but the aquaculture industry has not embraced this technology yet because of fears that triploids don't perform as well in farms as normal diploid fish, eroding profits."


'/>"/>

Contact: Lisa Horton
l.horton@uea.ac.uk
44-016-035-92764
University of East Anglia
Source:Eurekalert

Related medicine news :

1. Household Germ Study Finds Common Kitchen Items Harbor E. coli, Salmonella, Listeria, Yeast and Mold
2. They’re Back: Web Cam Catches Sockeye Salmon Returning to Tongass Spawning Grounds
3. Marler Clark Files Third Salmonella Lawsuit Against Holiday Inn Bordeaux
4. Marler Clark Files Lawsuit Against Fayetteville Holiday Inn Over Salmonella Outbreak
5. Las Vegas Couple Sues Firefly Restaurant Over Salmonella
6. Almost Nuts! Supports Whole Foods Decision on Banning Gentically Modified Salmon and Continues to Support the Movement Against Genetically Engineered Foods
7. Marler Clark, Elgin Couple Sue School Food Supplier over Child’s Salmonella Illness
8. Theyre Cute, But Chicks Carry Salmonella Dangers
9. Kids Pet Frogs Caused Salmonella Outbreak: CDC
10. Salmonella Fears Spur Major Recall of Pet Treats
11. Pet Hedgehogs Linked to Salmonella Outbreak in 8 States
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... ... Yisrayl Hawkins, Pastor and Overseer at The House of Yahweh, has released a ... books in the Holy Scriptures, Revelation. The Book of Revelation paints a picture of ... have tossed it off as mere rubbish, but Yisrayl Hawkins says that is because ...
(Date:10/12/2017)... ... October 12, 2017 , ... First Healthcare Compliance ... management, will showcase a range of technology and learning solutions at the 68th ... and Expo to be held October 14–18, 2017 at the Mandalay Bay Resort ...
(Date:10/12/2017)... ... October 12, 2017 , ... The American College of Medical Informatics (ACMI) ... FACMI, during the Opening Session of AMIA’s Annual Symposium in Washington, D.C. AMIA’s ... Morris F. Collen, a pioneer in the field of medical informatics, this prestigious award ...
(Date:10/12/2017)... ... ... Leading pediatric oncology experts at Children’s National Health System will ... the International Society of Paediatric Oncology (SIOP) Oct. 12-15. Chaired by Jeffrey ... Disorders at Children’s National, and Stephen P. Hunger, M.D., Chief of the Division ...
(Date:10/12/2017)... Miramar, FL (PRWEB) , ... October 12, 2017 ... ... is presenting the latest in wound care advancements to physician colleagues, skilled nursing ... lecture is titled, "Navigating the Treacherous Waters of Wound Care." , "At many ...
Breaking Medicine News(10 mins):
(Date:10/5/2017)... 2017  In response to the nationwide opioid ... Surgeons (AAOMS) released prescribing recommendations that urge ibuprofen ... as a first-line therapy to manage a patient,s ... Recognizing the value and importance of ... Prescribing: Acute and Postoperative Pain Management" stresses that ...
(Date:10/2/2017)...  Eli Lilly and Company (NYSE: LLY ... quarter of 2017 on Tuesday, October 24, 2017. Lilly ... with the investment community and media to further detail ... will begin at 9 a.m. Eastern time. Investors, media ... of the conference call through a link that will ...
(Date:9/28/2017)... -- Cohen Veterans Bioscience and Early Signal Foundation announce ... home sensors for real-time monitoring of patients with trauma-related ... organization focused on disruptive health solutions for rare disorders ... to record and integrate behavioral, cognitive, physiological and contextual ... ...
Breaking Medicine Technology: