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PostPosted: Fri Jul 15, 2011 9:11 am 
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Joined: Tue Sep 25, 2007 5:19 am
Posts: 249
Location: sweden
here,s a link to a clip of my leopoldi hanging on the surface,i wonder why they do this?
I know some members wrote about this behaviour before on this forum but i never really found out why they act like this.
It,s not a lack of oxygene cause i had altum in the same tank before and they never acted like this.

maybe they try to collect small animals(flies etc) from the surface?

Maybe someone knows..


http://www.youtube.com/watch?v=n42xROJx9iU


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PostPosted: Sat Jul 16, 2011 3:03 am 
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Location: Israel
Is this behavior repeats itself?
Once I noticed Altum behave like that, but I thought it was some type of damage / disturbance appeared soon after frenzy feeding and fighting


I observed it for two days, then the fish had recovered (my assumption) and never repeated the same behavior


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PostPosted: Sat Jul 16, 2011 7:56 am 
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Location: Bishop's Waltham UK
That behaviour looks to me, like fish that are experiencing a lower level of dissolved Oxygen than they would like, and they are seeking the highest levels available to them at the surface.


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PostPosted: Mon Jul 18, 2011 4:06 am 
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Phill Austen wrote:
That behaviour looks to me, like fish that are experiencing a lower level of dissolved Oxygen than they would like, and they are seeking the highest levels available to them at the surface.


i found back the thread where it was discussed and there it seems they had a different opinion.

http://www.finarama.com/forum/viewtopic ... m+leopoldi


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PostPosted: Mon Jul 18, 2011 4:24 am 
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I see what you mean Andries, it appears to be a behavioural trait with the Leos. One contributor to the thread said that his Altum also did this. The excellent video that you posted showed the fish with what I took to be an accellerated breathing rate as they passed surface water And/or air over the gills. Could this be a behaviour to recover blood Oxygen levels after a bout of exertion? or to prepare for something that requires better oxygenation?, Digestion?


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PostPosted: Fri Aug 19, 2011 12:13 pm 
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Joined: Wed Dec 10, 2003 10:26 am
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Location: Clarkston, WA USA
The P. leopoldi may have gill flukes.
Gill flukes compromise breathing and the results or symptoms are similar to a dissolved O2 level.
The Rummy Nose Tetras seem to be acting fine and they do not handle low dissolved O2 levels well.

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Larry Waybright
Trout fly fisherman.


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