Re: [Killietalk] cool water versus oxygenated water

["Drummond Howard" <drummondhoward at hotmail_com>]

I'm speculating here, but maybe the cooler temps reduce the oxygen 
requirements by slowing their metabolism?  I would also speculate they would 
use less oxygen in an aquarium with almost no flowing water verses fast 
flowing water where they have to expend much more energy to move around.

If we are talking about tank raised fish verses wild fish there are probably 
conditioning factors to consider.  I understand it is very difficult just to 
keep wild caught fish alive in an aquarium much less breed them.

You can take a person who has lived all their life in NY city and drop them 
in the most rual town in america and they will probably survive.  They 
probably won't be happy, but they should survive.  It might even make an 
interesting "reality" show.  "What do you mean there's no Starbucks!"



Drummond Howard
Gaithersburg, Maryland





>From: Gary Elson  or Mary Frauley <fraulels at videotron_ca>
>Reply-To: killifish discussion list <killietalk at aka_org>
>To: killifish discussion list <killietalk at aka_org>
>Subject: [Killietalk] cool water versus oxygenated water
>Date: Wed, 13 Sep 2006 07:05:35 -0400
>
>Hi,
>I've been talking cichlids with a friend who returned from the rapids of 
>the Congo River recently, and have a question for those list members who 
>have either been collecting in West Africa, or keep "cool water" (under 
>70f)  Aphyosemions.
>
>It comes out of his observation that Nanochromis dwarf cichlids, which some 
>aquarists have found easier to keep and breed in cool water, come from 
>quite uniformly hot conditions in the wild. They also come from highly 
>oxygenated, flowing water.
>
>There are a number of Aphyosemions (ocellatum, zygaima, some elberti, 
>punctatum) that have bred well here if kept cool, or kept in very shallow 
>water (or both). Since cool and shallow water both have higher oxygen 
>concentrations than our usual slow bubbling killie tanks, are what we're 
>calling coolwater Aphyosemions really just fishes with high oxygen needs 
>mislabelled by stay at home hobbyists like myself? I'm curious about the 
>shaded forest streams from which many of our killies come. Can anyone 
>comment on water temperatures in these wild habitats?
>
>Gary
>Join the AKA at http://www.aka.org/aka/modules/content/index.php?id=9.
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