Re: RE: NANFA-- Freckled Madtom observations

Moontanman_at_aol.com (jrshute at bellsouth.net)
Sun, 13 Jan 2002 12:18:43 -0500

Some madtoms really do seem to prefer hanging out high in the water. These usually seem to be pool dwellers. We made an interesting observation on young Noturus stigmosus (the southern form of the northern madtom)that we spawned at CFI. After absorbing the yolk, the young headed up! Most of them hung out in some nylon spawning mops that were in the tank (don't ask me why we had nylon mops in a madtom tank...I don't remember!)We never see this with other madtom young. They are all strongly benthic. We were wondering if it is an adaptation to silty/muddy substrate like is found in the Hatchie R. where these guys came from.

We were also able to collect several species of madtoms up in vegatation snags in the Hatchie (N. nocturnus, phaeus and the occasional hildebrandi.

J.R.
>
> From: "Denkhaus, Robert" <DenkhaR_at_Ci.Fort-Worth.TX.US>
> Date: 2002/01/13 Sun AM 10:37:37 EST
> To: "'nanfa_at_aquaria.net'" <nanfa at aquaria.net>
> Subject: RE: NANFA-- Freckled Madtom observations
>
> The idea that this behavior is more common in adults than in juveniles could
> mean that my techniques for looking for adult madtoms down among the
> detritus and other substrate materials may be all wrong. Maybe I should be
> hitting higher up in the vegetation! So, vertically speaking, where does
> everyone find their madtoms? The young of the year that I have been rearing
> all originally came from out of a dense layer of decaying cottonwood,
> sycamore, and oak leaves in about a foot of water. No submerged or emergent
> vegetation was present. As I think about this though I remember catching a
> few adults years ago amongst a dense stand of lotus while trying to catch
> dragonfly nymphs.
>
> Rob Denkhaus
> Fort Worth Nature Center & Refuge
>
> > -----Original Message-----
> > From: Edward Venn
> > Sent: Saturday, January 12, 2002 10:54 PM
> > To: nanfa_at_aquaria.net
> > Subject: Re: NANFA-- Freckled Madtom observations
> >
> >
> > Bruce,
> >
> > Is this found only in adults or do juveniles exhibit the same
> > behaviour?
> > Could this behaviour related to the onset of breeding as in
> > the catfish
> > found in Japan?
> > >
> > >Rob, I've had the same behavior from my tadpole madtoms.
> > The more dense
> > >the
> > >foliage, the more likely for them to exhibit this behavior.
> > If you have
> > >both
> > >bottom cover & a dense growth of plants, madtoms will occupy both.
> > >
> > >Bruce Scott
> > >Meridian, Idaho
> >
>
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/ For more information about NANFA, visit our web page, http://www.nanfa.org