RE: [RML] pH and fish physiology

Lorraine (overall077 at lycos.com)
Thu, 24 Nov 2005 22:28:59 -0700

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It has to do with osmotic pressure. On the gills I believe.

It is not the pH that is a problem it is the TDS (total dissolved Solids).
Softer water = damage to gill membranes?

Harder water no problem.

I use TDS meter now and don't worry one bit about pH, If the TDS is a close
match then the fish do great.

Lorraine

In sunny Colorado.

http://lorraines-killies.com

_____

From: r_m_l at yahoogroups.com [r_m_l at yahoogroups.com] On Behalf Of
Julie Zeppieri
Sent: Thursday, November 24, 2005 10:18 PM
To: r_m_l at yahoogroups.com
Subject: [RML] pH and fish physiology

Hi All,

I have a question to pose to the list. I asked Unmack, but for once he
couldn't come through. So, I am putting it out there in hopes one other of
y'all might have the answer.

A friend asked me why it is -- metabolically/physiologically speaking --
that it is more dangerous to
fish to experience a sudden drop in pH than for them to experience a sudden
rise in pH.

While I know that this IS true (and have seen it in action MANY times), I am

at a loss to explain WHY it is so.

Can you give me the basics of this so that I may pass it on?

TIA!
Julie <'><