Re: [Killietalk] Couple of questions

[Barry Cooper <bjc3 at centurytel_net>]

Yes. Low osmotic environments cause the cells to swell, with the 
potential to rupture, or at least become dysfunctional. Gill cells would 
be vulnerable due to their direct exposure. Fish need time to adapt to 
such changes, to allow the mechanisms they possess for pumping ions in 
and out to adapt. In biological systems water goes where ions go. There 
are no water pumps, but there are water channels, that also can be up 
and down regulated.

Barry

Barry J. Cooper
Sweet Home, OR 97386



Bill Shenefelt wrote:

>Isn't going from High TDS to low TDS simply a matter of pressurizing cells 
>with more pure water entering the cell than minerals exiting the cell, maybe 
>to the bursting point?  Going the other direction although it may deplete 
>the cells at least does not explode them.  A small change 25% can be handled 
>by the fish'es system but larger changes (halving the TDS) or more reesult 
>in more stress and potentially death.
>Bill Shenefelt
>http://sheneskillies.com/ 
>
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