Re: [RML] Tateurndina breeding
HH (Harro.Hieronimus at t-online.de)
Fri, 22 Jan 1999 11:28:23 +0100
Adrian Tappin schrieb:
> At 06:47 21/01/99 +-100,Hans wrote:
> >
> >>From time to time the use of PVC tubes as breeding caves for Tateurndina is
> >recommended. Is this for permanent breeding setups? Have you observed any
> >negative (toxic) effects of using PVC?
> >
> >I have tried half-transparent green tubes (Eheim piping), but so far they
> >have not made use of them, instead they breed in flower pots and the
> >corners of the tank.
>
> When it comes to the use of PVC tubing the fish seem to be particular fussy
> as to the inside diameter of the pipe. If its not the right size they will
> not use it. It would appear that it should be just large enough to let the
> pair enter. Also you need to stop it from moving when they enter. The best
> way is to weight it down with a flat rock or something.
>
> As for negative (toxic) effects - I use electrical pvc tubing and have use
> it for many years for breeding whiptail catfish mainly and never had any
> problems.
>
> Adrian.
>
> Adrian R. Tappin
> "Home of the Rainbowfish"
> http://www.ecn.net.au/~atappin/home.htm
>
To avoid any toxical effects of PVC - which for itself isn't toxic at all -
avoid
1. every PVC which isn't totally hard, e.g. flexible. In these cases a softening
agent has been added. This agent is washed out by water and may effect the fish
negatively. Everybody using those small green tubes for air or water will notice
that they become hard after some time. Well, the effect is very low, the one
with larger tubings is larger. If you want to totally avoid softeners, take
silicone tubes.
2. all coloured PVC (except of the grey ones) may have colour adds which may be
toxic. In some parts of the world cadmium is still used for yellow colours, and
other heavy metals for other colours. So plain grey hard tubings are best and
shouldn't have any toxic effects on your fish. But be very careful if you cut it
to pieces that the ends are softened by yourself as the are very pointed
sometimes and may hurt catfish eventually.
Best regards
Harro Hieronimus, Solingen, Germany
harro.hieronimus at t-online.de
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No fish - no fun
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