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Roosting Behavior in Sunfish


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#1 centrarchid

centrarchid
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Posted 06 May 2018 - 07:32 AM

I have a 300-gallon tank by barn with some longear and bluegill in it.  Tank is about 36" deep.  Each night the sunfish come up to sleep on ledge just below surface.  During the day they are not to be seen.  Will be watching for roosting site fidelity.  Individuals can be discerned by patterns and size.


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#2 gerald

gerald
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  • Wake Forest, North Carolina

Posted 06 May 2018 - 08:30 AM

Maybe related to dissolved oxygen stratification?  Hard to get a good nights sleep if you can't breathe.


Gerald Pottern
-----------------------
Hangin' on the Neuse
"Taxonomy is the diaper used to organize the mess of evolution into discrete packages" - M.Sandel


#3 Michael Wolfe

Michael Wolfe
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  • North Georgia, Oconee River Drainage

Posted 06 May 2018 - 05:23 PM

maybe predator avoidance specific location?  would they fear herons more in the day... most wading predators seem to actively "look into the water".  on the other hand, large catfish prowl around at night, so shallow water helps you avoid bigger fish?  At least that's my hypothesis,


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#4 NotCousteau

NotCousteau
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  • Minnesota

Posted 06 May 2018 - 07:09 PM

I definitely have some fish that roost higher in the aquarium at night. Maybe its just a species thing?

Cool observations. Thanks for sharing, and keep us updated. Photos would be cool.

#5 Matt DeLaVega

Matt DeLaVega
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  • Ohio

Posted 07 May 2018 - 03:42 PM

maybe predator avoidance specific location?  would they fear herons more in the day... most wading predators seem to actively "look into the water".  on the other hand, large catfish prowl around at night, so shallow water helps you avoid bigger fish?  At least that's my hypothesis,

This is pretty much what I think. I have a hypothesis too, but it would take a while and pretty much leads to what Michael said. It makes sense to me.


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