Fisheries producing smaller less fertile fish


	Fisheries producing smaller less fertile fish

pokkets

11-23-2007 2:56 AM

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tags:

fish, fishing, evolution, human, intervention

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11-23-2007 12:46 PM

righthand

"We are running up a Darwinian debt that future generations will have to pay back."

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/a40c0816-c23a-4ef1-9040-a67bc67b5e0d/4F72BE10-9AAC-4BDD-B944-78C2BFCB453B/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro" href="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro" style="font-size: 11px;">www.abc.net.au</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro"> Karin Strohecker</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro">Industrial-scale fisheries have changed fish evolution, exacerbating the effect of overfishing by producing smaller and less fertile fish,</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.abc.net.au/img/CC17C488-DFAE-490B-99C1-425EB6201189" alt="fish on ice" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro"><P>Dr Ulf Dieckmann, from the <A target="_blank" href="http://www.iiasa.ac.at/">International Institute for Applied Systems Analysis</A> in Austria, and co-authors write a commentary on managing fish stocks today in the journal <A target="_blank" href="http://www.sciencemag.org"><EM>Science</EM></A>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro">Dieckmann also says that overfishing and the practice of throwing lower quality fish back into the sea to raise the value of fishing quotas might explain the massive drop in population</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro">"Human activity had a possibly irreversible evolutionary effect in just a few generations," he says</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro">"We are running up a Darwinian debt that future generations will have to pay back."</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro"><P>Looking at fishery data from the past few decades, the scientists found that increased mortality due to overfishing has favoured fish that mature smaller and earlier, yet also carry far fewer eggs at their first reproduction.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/23/2099040.htm?site=science&topic=enviro">"The question is not whether such evolution will occur, but how fast</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/4F72BE10-9AAC-4BDD-B944-78C2BFCB453B/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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