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Subject: TWL: Re: An Environmental Whacko Responds
From: Mel Knott (hknott4@XXX.XXX)
Date: Mon Dec 02 2002 - 19:20:49 EST
----- Original Message -----
From: "Alex Hirsekorn" <alexh@XXX.XXX>
> ----- Original Message -----
> From: "Kurt Reno" <kreno@XXX.XXX>
> >
> > Here in Ohio the farmers load up ponds with Copper Sulfphate to the
point
> > where the ponds are totally blue. The fish do fine, the algae dies and
the
> > people eat the fish. Copper Sulphate is much better at suppressing
growth
> > than Copper Oxide because of its total solubility. Nobody is screaming
here
> > in Ohio. I suspect that the Enviro-Whacko's have no real evidence of
damage
> > caused by antifouling paints but just suppose it happens.
> >
> Hi Kurt,
>
> I think that if you were to research this topic in a bit more depth you
would find that
> comparisons between a small (<10acre) fishpond and the ocean are not very
useful.
>
Alex,
I'd be willing to bet money that what Kurt is seeing in the farm ponds is
not copper sulfate (although it is used for algae control) but instead is a
product called Aquashade. It is a blue dye that is deliberately used in
concentrations that cause the pond water to turn blue. Its purpose is to
"shade" or filter out enough of the insolation (sunlight penetration) to
reduce algal growth. It is used specifically because it is not toxic like
copper compounds. If enough copper sulfate was used to cause the pond to
turn blue, nothing would survive.
-Mel
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