Re: [Killietalk] carbonates (probably)

[rgoldstein at rjgacarolina_com]

>>
> 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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