Re: [Killietalk] Couple of questions

["Edd Kray" <edd at catfishnthecrawlers_com>]

Now this is interesting set of posts and an example of why we have to be
careful with our terminology ("high" "low")

I refer you to a recent article in TFH on water quality in the Amazon. I
think it was by Wayne Liebel (but don't make me bet on that and I'm not
going to bother to go look).

He points out that a MAJOR stimulus for spawning behavior in many groups of
Amazon fishes is a lowering of TDS values in the rivers and ponds after a
rainy period.

So is lowering TDS "a sure fire recipe for disaster"? or do we need to be a
little more specific about the actual values involved?

My opinion, yes going from 1000 to 0 would make many fish at least
"osmotically uncomfortable" (unless you're a salmon). From 150 to 50 just
might get them spawning when they weren't before.

Edd



-----Original Message-----
From: killietalk-bounces at aka_org [mailto:killietalk-bounces at aka_org] On
Behalf Of Brian Watters
Sent: Wednesday, February 01, 2006 8:01 PM
To: killifish discussion list
Subject: Re: [Killietalk] Couple of questions

Gary Hoover wrote:

>
>   Wouldn't replacing low TDS water with low TDS water be less
> likely to  shock?  You'd think if harder water was used, it would
> range in  hardness more.  Though a small change in the TDS of low
> TDS water,  it would be a fairly high percentage change...
>

When we change water for wild collected Nothos in the field, one of our
golden rules is to ensure that the water we use for changing has
approximately the same, or higher, TDS than the water they were in in the
habitat or in the bags. They will always be able to tolerate going from
relatively low TDS water to relatively high TDS water. However, going the
other way is a sure fire recipe for disaster.
________________________________________
Brian Watters
6141 Parkwood Drive
Nanaimo, British Columbia V9T 6A2, Canada
Tel: (250) 760-0564
E-mail: bwatters at shaw_ca

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