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Unfolding Nature Shop: Unfolding Nature: Being in the Implicate Order

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OfflineVisionsToReality
RIBBONS


Registered: 09/22/07
Posts: 1,083
Last seen: 16 years, 1 month
Captive breeding weakens some species
    #7487932 - 10/05/07 10:25 AM (16 years, 3 months ago)

I found this interesting, considering the fact that we are wiping out huge numbers of species every year
http://news.bbc.co.uk/2/hi/science/nature/7026997.stm

Main points that I cut n' pasted:

US scientists found steelhead trout reared in hatcheries were much less good at reproducing than wild fish.

Writing in the journal Science, they say the use of captive breeding needs careful re-consideration.

For some animals, such as amphibians, captive breeding is being used more and more as wild habitats disappear.

"This study proves with no doubt that wild fish and hatchery fish are not the same, despite their appearances," said Michael Blouin of Oregon State University in Corvallis, US, who oversaw the research.
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"With wild Atlantic salmon, within two or three months about 90% of the eggs or the fry are dead, so you can imagine that's a large selective effect; whereas in the hatcheries, everybody gets to live, so traits that would quickly be rooted out in the wild are able to survive in the hatcheries. So we're building in that maladaptedness."
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Not all species would be likely to lose their reproductive fitness as quickly as the steelhead. But for those that do, the effectiveness of captive rearing and re-introduction as a survival strategy is now less assured; and relying on a continuing release of captive-reared individuals would prevent re-adaptation.


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So when you're ridin' through the ruts,
Don't you complicate your mind.

Flee from hate, mischief and jealousy
Don't bury your thoughts,
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Unfolding Nature Shop: Unfolding Nature: Being in the Implicate Order


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