Re: [Killietalk] UV irradiation ... WAS ... Flow thru systems

["Markus&Heather Brown" <TheBiologist at charter_net>]

You might want to look into how much U.V radiation is required to kill the
crypto or any other such ecto parisites. It is a huge dose, only provided by
the largest of comercial U.V sterolizers. Of course water clarity and time
durration of exposure are critical in calculating the nessesary Uw's
requierd to "sterolize"anything. If i remember right, it takes 336'000 Uw's
to kill off the Ich tomites. Thats allot! More large reef people use ozone
in thier protien skimmers than U.V for this and other reasons!
Markus
----- Original Message ----- 
From: "Chris" <cgraseck at optonline_net>
To: "'killifish discussion list'" <killietalk at aka_org>
Sent: Wednesday, January 14, 2004 8:08 AM
Subject: RE: [Killietalk] UV irradiation ... WAS ... Flow thru systems


> Yes Barry I agree with you.
>
> The only reason that I'm thinking of adding UV to my reef is that many
> successful reefers use it in their systems.  The argument being that
> small polyp stony corals benefit from reduced bacteria counts.  Others
> argue that the increase in micro fauna, without UV, is more beneficial.
> I don't think I'll add one unless I decide to put a Tang in the tank.
> They are very susceptible to marine ich (Cryptocaryon irritans).
>
> Chris
>
> -----Original Message-----
> From: killietalk-bounces at aka_org [mailto:killietalk-bounces at aka_org] On
> Behalf Of Barry Cooper
> Sent: Wednesday, January 14, 2004 10:01 AM
> To: killifish discussion list
> Subject: RE: [Killietalk] UV irradiation ... WAS ... Flow thru systems
>
> See below:
>
> At 09:17 AM 1/14/2004 -0500, you wrote:
> >I think that you have to remember that we are dealing with closed
> >systems, consisting of very very small volumes of polluted water.  The
> >potential for the proliferation of pathogens is such small volumes is
> >immense.  UV theoretically sterilizes all water flowing back to the
> >system preventing the spread of disease from one fish (tank in a
> system)
> >to the other.  Some of these pathogens are quite lethal such as Glugea
> >and some Mycobacteria.  You wouldn't want to expose yourself to TB just
> >to jump start your own immune system.  There will still be immune
> >challenges to your fish.  Live food will continually bring in
> >opportunistic organisms to test their immune systems,  so I would think
> >that UV would be a good addition to almost any tank and would be
> >essential in a recirculating system.
> >
> >I'm thinking of adding one to my reef tank although that will certainly
> >reduce my micro fauna populations.
>
> Chris, I would not necessarily add UV to a single tank just for the sake
> of
> it. The only reason I used UV was because a number of tanks were using a
>
> common sump, creating a potential for cross contamination. For a single
> tank, I think adequate water changes, biofiltration and, most
> importantly,
> good quarantine procedures are the best approach. With my new flow
> through
> exchange system, where each tank is isolated, I have removed the UV
> filters.
>
> 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
>
>
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>
>
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