Re: [Killietalk] Flow-thru/Rec. Systems with Various sp. of Killifish

[Barry Cooper <bjc3 at centurytel_net>]

At 06:09 PM 11/22/2003 +0000, Tim wrote:
> I agree with Barry's comments. Fish excrete other things apart from
> metabolic wastes such as hormones which are best taken out.
> I once saw a commercial flow through system for coldwater fish which was
> very efficient. These are perhaps the most dirty fish you can imagine
> concerning waste production.
> The question rises concerning how hormones are broken up & degraded in
> nature.


I don't know of any data, but presumably in some environments they are 
washed away by flowing water, as Lee implied. However, in ponds, such as 
Nothos live in, that probably is insignificant. I would assume that the 
flora in the water and substrate break down these organic compounds quite 
readily. I don't think we can come close to mimicking the flora of a 
natural environment in our tanks.

Barry
_____________________________________________________________
Barry J. Cooper, Prof. Emeritus, Dept. Biomedical Sciences, Cornell University
Professor, College of Veterinary Medicine, Oregon State University
Home address: 27505 Riggs Hill Rd., Sweet Home, OR 97386 (bjc3 at cornell_edu) 


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