RE: [Killietalk] Nothos

[Chris <cgraseck at optonline_net>]

Sounds like a good way to cause terminal dehydration.

Nothos are freshwater fish.  Their bodies are built to exclude and
eliminate water.  Water is always trying to rush into their epithelial
cells due to osmotic pressure.  Salt water fish are built to do just the
opposite.  They have to fight to keep the water in as the osmotic
pressure is going in the opposite direction. Water will naturally flow
across a water permeable membrane (in this case a cell membrane) in the
direction of the higher concentration solutes.  With fresh water fish
the concentration of solutes (in this case salt, in the form of Na+ and
Cl- ions) is greater inside their cells.  Water is always trying to find
a way in and must be excluded and eliminated.  With salt water fish the
concentration of dissolved salts is greater outside the cells so the
water is drawn out and must be held back/pumped in.  As far as I know
all cell membranes are somewhat permeable to water so the fish have to
work (use energy) to maintain the level of Na+ and Cl- that allows their
cells to function.  Some fish can tolerate wide variations.  These are
usually estuarine fish.  I may be mistaken Paul, but I don't think we
have any estuarine Nothos.  Nothos tolerate salt to some degree but sea
water is probably outside of their survival envelope.

Full strength sea water has a specific gravity of 1.023 to 1.027
I use about a cup of synthetic saltwater mix per gallon of water when I
make salt water for my reef tank. This gives me a specific gravity of
1.027.  

Chris
Rye NY


 

-----Original Message-----
From: killietalk-bounces+cgraseck=optonline_net at aka.org
[mailto:killietalk-bounces+cgraseck=optonline_net at aka.org] On Behalf Of
Paul_Jablinski at notes.udayton.edu
Sent: Friday, March 05, 2004 8:02 AM
To: killifish discussion list
Subject: Re: [Killietalk] Nothos

Why not!  When a Notho fish dies, or seemingly dies, a person can revive
it
by adding a lot of salt to the container and in less than an hour the
fish
will come alive again and breed again.  I don't know just how much salt
is
used in a salt water tank, but I would guess that it is much less than
what
a person would add to revive the dead Notho.


-----killietalk-bounces+paul_jablinski=notes.udayton.edu at aka.org wrote:
-----

To: killifish discussion list <killietalk at aka_org>
From: Joe Bulterman <jbulterman at yahoo_com>
Sent by: killietalk-bounces+paul_jablinski=notes.udayton.edu at aka.org
Date: 03/05/2004 04:29AM
Subject: Re: [Killietalk] Nothos

This is the kind of question I expected to see when beings from another
planet
first contact us :)

--- bjc3 at centurytel_net wrote:
> I've never tried it, but I would think not.
>
> Barry
>
> ----- Original Message -----
> From: Paul_Jablinski at notes.udayton.edu
> To: killifish discussion list <killietalk at aka_org>
> Sent: Thu, 4 Mar 2004 14:36:22 -0500
> Subject: [Killietalk] Nothos
>
> >
> >
> >
> >
> >
> > Does anyone know if Nothos can live in a regular salt water tank
with
other
> > marine fish?
> > Bro. Paul
> >
> >
> > To join the AKA see http://www.aka.org/pages/join.html
> > Archives are at http://fins.actwin.com/killietalk/
> >
> >
>
>
>
>
>
>
> To join the AKA see http://www.aka.org/pages/join.html
> Archives are at http://fins.actwin.com/killietalk/


=====
Joe Bulterman, School of Foreign Languages
Beykent Üniversitesi
Ortaköy Egitim Merkezi
Dereboyu Cad. No: 94/B Ortaköy/Istanbul, TURKEY
(+90) 0555 259 1412 (Mobil)
(+90) 212 327 4963 (Work)
(+90) 212 327 4967 (Fax)

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