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

>"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."


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

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