Quoth tony regarding Re: NANFA-- [Fwd: BOUNCE nanfa_at_aqua:
> A few questions about this:
> 1] How does the trematode get to the catfish? Via eating the snail,
> eating snail droppings, or the parasite leave the snail and actively
> get into the catfish? If the black carp eat snail with parasite won't
> it be infected or become the host and become inedible? 2] Aren't there
> other NA fishes [bullheads, buffalos, suckers, perches, etc.] or
> turtles or birds that can eat snail? Isn't reducing the number of
> small snail enough to reduce the parasite problem? Aren't there other
> snail eating nonnative fishes that find it hard to overwinter or breed
> in the Mississippi? eg. carp of the genus Probarbus [tropical,
> required clear running water and gravel bed with free silt to spawn],
> etc.
>
> Tony
>
> >
> > Those in favor of having the option to use black carp gave the
> > following arguments: First, there is no known therapeutant for the
> > trematode and chemicals that control the snail populations are not
> > FDA approved for use in foodfish. So currently, the black carp is
> > the only known method of complete snail control for the trematode in
> > question. While many argue that there are native species such as the
> > redear or shellcracker sunfish which are capable of controlling
> > snail populations, research has demonstrated that redear sunfish do
> > not adequately control snail populations in ponds. Redear avoid
> > snails with hard shells and their mouth gape size limits the size of
> > snail they can consume. The black carp is the only fish species that
> > is morphologically designed to crush snails with hard shells and has
> > an adequate gape size.
>
>
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Prost,
Martin
------
"Cry to it, nuncle. as the cockney did to the eels when she put
'em i' the paste alive; she knapped 'em o' the coxcombs with a
stick, and cried 'Down wantons, down!'"
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/ For more information about NANFA, visit our web page, http://www.nanfa.org