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Re: [Killietalk] carbonates (probably)
One thing with fertilization is that the water can
play a big part (obviously). Most of the studies have
been done on either food fish or marine, but in
general things apply equally.
Sperm need to be activated before they are any use,
that is switched on so they start swimming around. Ph
and ion K+ Mg++ etc concentrations will definitely
affect this.
The same thing basically happens with the eggs, there
is some very complicated "electronics" happening on
the membranes which is also dictated by the respective
ion concentrations. One simple reason for this is to
ensure that the egg is only fertilised once and so on.
So for breeding the actual relative ion concentrations
can be very important, especially if you are getting
lots of white eggs. Another reason why I am skeptical
of TDS measurements - salty or not?
I think it was Erny that asked but a couple of
interesting papers online, (if you sift out the bits
you like).
Fertilization ecology of egg coats: physical versus
chemical contributions to fertilization success of
free-spawned eggs.
http://jeb.biologists.org/cgi/content/full/205/11/1657
Ion Channels in Sperm Physiology
http://physrev.physiology.org/cgi/content/full/79/2/481
Scott Douglass
Singapore
--- rgoldstein at rjgacarolina_com wrote:
> >>
> > High GH (8 or10+ degrees) seems to make eggs of
> rainforest species have
> > trouble hatching. It acts about like adding too
> much dye and the chorion
> > seems to get too tough to be broken down by the
> hatch enzymes. I have
> > never seen sound documentation of this, but it is
> common mythology that
> > seems to hold sorta true. IDK what effect it has
> on the ovaries, because
> > my fish simply won't let me fool with them.
> >
>
> First of all, shame on you for trying to fool with
> your fishes' ovaries
> :). But back to the dye interaction with chorions.
> The internal layers of
> the chorion are proteins subject to destruction by
> chorionase from the
> throats of the hatching fry. I don't know how dyes
> could affect these
> proteins and not the fry's other proteins, which
> would kill them. I think
> a more likely effect of too much dye (and I agree
> there can be too much)
> is that it prevents bacterial growth necesary to
> generate the carbon
> dioxide needed to stimulate the release of
> chorionase. No bacterial
> metabolism leads to no CO2 trigger, to no release of
> hatching enzyme, and
> no dissolution of the inner layers of the chorion.
> Like you, I have no
> evidence, but this is just a biologist's thought
> processes at work (a rare
> event in my case). - RJG
>
>
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