Re: My killifish rack

[Barry Cooper <bjc3 at cornell_edu>]

I have UV sterilizers on each of my recirculating racks. In my opinion, 
they are helpful, as long as you have a powerful enough unit for the volume 
of water being treated. The most likely problem you are likely to have is 
that particulates can shield organisms from the UV. This is a particular 
problem if you are breeding peat spawners, as you do get peat in the water. 
To minimize this, I put the pump that is circulating the water in the 
bottom of a bucket that is submerged in the sump. Water returns to the sump 
at a distance from the bucket, so that settling occurs in the sump and the 
bucket picks up a minimum of peat or other debris. I also feel that in a 
recirculating system you are trying to reduce the bacterial flora, not 
eliminate it. I did an experiment in which I took a drop of water from a 
treated sump and one from a sump that was not yet set up on UV, and 
cultured them on bacterial culture plates. The treated water grew about 50% 
of the number of colonies that the untreated water did, strongly suggesting 
to me that the UV was effective in reducing total bacterial load.

Again, don't buy too small a unit to save money. Buy one that is rated for 
a volume greater than what you intend to treat.

Barry

At 11:28 AM 9/2/2002 -0600, you wrote:
>Would a UV sterilizer take care of this problem??? Ive seen them for 50-120$
>and thinking of useing one on a flow though system......
>
>Adam Rychlik
>
>
>"Tom, one of the gripe I have with centralized filtration is the control
>of disease.  My lesson from the total wipeout of RAC beira 98 is not
>forgotten... not yet anyway."
>
>----- Original Message -----
>From: "Ron @ CCK" <ronwill at starhub_net.sg>
>To: <KillieTalk at AKA_Org>
>Sent: Thursday, August 29, 2002 8:13 PM
>Subject: Re: My killifish rack
>
>
> > Hi all, thanks for the comments!
> >
> > > From: "Al Anderson" <killiman at iquest_net>
> > > Could you do a close up of the fittings you used for the bulkheads?
> >
> > Al, the bulkheads consist of 2pcs 1/2" pvc elbows (internal thread on
> > one and external on the other) and 2 oversized rubber washers that needs
> > to be trimmed down.  To adjust water height, change the internal pipe
> > (in the pic) accordingly.  I'm still working on the internal overflow
> > box and will post it up when prints are developed and scanned (yeah
> > right... the out-dated method).
> >
> > ================================================================
> >
> > > From: TomPayne <paynedds at voyager_net>
> > > the sump. I pump the water out of the sump with a RIO 1700 (I think
> > > that's the model) pump that supplies 1/2" PVC manifolds.
> >
> > Tom, one of the gripe I have with centralized filtration is the control
> > of disease.  My lesson from the total wipeout of RAC beira 98 is not
> > forgotten... not yet anyway.
> >
> > > have the black drip valves that JEHMCO sells that supply the tanks via
> > > airline tubing. I run the supply lines at a rate that is not a
> > > continuous flow but is a very fast drip....
> >
> > If you've looked at the online album, you'd know that there's a limit as
> > to what I can install OUTSIDE the apartment along the corridor or public
> > hallway.  I'm cheating a little in running a AC main extension for the
> > airpump near the ceiling but hooking up a water pipe would be pushing
> > it.   It's a good idea tho and I'd experiment with less-permanent
> > fixtures.
> >
> > > I use 1/2' CPVC Tee fittings for over-flows with paint strainer
> > > (Al's suggestion) netting to keep the fish in the tank.
> > Is that tea or paint strainer?? (does one actually strain paint?)
> >
> > > The Tee's (Jim Robinson's video showed me this
> > > idea) give me two overflows, at different water levels.
> > I'm working with extra plastic tanks on similar ideas, except that the
> > twin overflow is housed within ONE box.
> >
> > > I really gotta get a digital camera...... I just missed
> > > the one Wright was touting on E-bay a month ors so ago!
> > yeah.. me too!  and is that the Sony you missed?
> >
> > Regards,
> > Ronnie Lee
> > Singapore
> >
> > ---------------
> > See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
> > Join the AKA at http://www.aka.org/AKA/Applic.htm
> >
> >
>
>
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Barry J. Cooper, Prof. Emeritus, Dept. Biomedical Sciences, Cornell University
Adjunct faculty, College of Veterinary Medicine, Oregon State University
27505 Riggs Hill Rd., Sweet Home, OR 97386 (bjc3 at cornell_edu)


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