Crayfish chill out after watching a fight

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	Crayfish chill out after watching a fight

pokkets

3-11-2008 10:41 AM

418 views

pokkets says:

Seems,as with people, it can be more than just personal, but also a spectator sport. When a spectator was put into another tank with a similar sized opponent they were less likely to fight than those who had not seen a fight.
An interesting observation about Australian Yabbies (smaller river crayfish) They prefer to fight an opponent they've met before.

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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://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/b733d8b2-b8f1-4e18-8b8c-fc1b53f9b1a1/6B6B5BAA-97CC-4C77-9AD2-BEDDD7CDF759/" 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/2008/03/11/2186563.htm?site=science&topic=enviro" href="http://www.abc.net.au/science/articles/2008/03/11/2186563.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/2008/03/11/2186563.htm?site=science&topic=enviro"> Jennifer Viegas</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/2008/03/11/2186563.htm?site=science&topic=enviro"><P class="first">Male crayfish appear to calm down after watching a fight, according to US research that adds to growing evidence that individuals, particularly males, of many species watch competitive encounters.</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/2008/03/11/2186563.htm?site=science&topic=enviro"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.abc.net.au/img/B421E8A2-59D0-42BB-8DE6-E2DBD2814DD6" alt="crayfish on highway" /></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/2008/03/11/2186563.htm?site=science&topic=enviro"><P>Across the animal world, viewing such events either seems to stimulate further aggression, or lessen it.</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/2008/03/11/2186563.htm?site=science&topic=enviro"><P>During a typical fight, crayfish approach each other with their big pincers or chelae out as far as possible.</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/2008/03/11/2186563.htm?site=science&topic=enviro">They then go into what is known as the 'boxing phase', during which the "crayfish spend considerable amounts of time pushing and not pinching with their claws"</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/2008/03/11/2186563.htm?site=science&topic=enviro"><P>If nobody backs down, the fight escalates as the crayfish use their pincers to grab at each other. Like wrestlers, they attempt to flip over their rivals or forcibly move them around.</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/2008/03/11/2186563.htm?site=science&topic=enviro"><P>If both competitors are still standing at that point, the fight reaches a final, brutal stage. </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/2008/03/11/2186563.htm?site=science&topic=enviro">During this rarely reached phase, the crayfish attempt to cause physical harm, such as the removal of an opponent's chelae or limb</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/6B6B5BAA-97CC-4C77-9AD2-BEDDD7CDF759/blog/" title="blog or email this clip"><img src="http://content7.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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