Re: [Killietalk] carbonates (probably)

["Robert Goldstein" <rgoldstein at rjgaCarolina_com>]

I think the literature indicates that increased concentrations of CO2 result 
in activation/release of chorionase. In annuals that would likely come from 
decomposition, but among non-annuals you could get the same CO2 production 
from the day/night shift in respiration vs. oxygen production by surrounding 
aquatic vegetation. In either case, CO2 spikes and the hatching enzyme 
glands respond. At least, that's how I remember the old Weitzman & Wourms 
literature on the subject. I don't know if there have been any significant 
advances since.

----- Original Message ----- 
From: "Chris" <cgraseck at optonline_net>
To: "'killifish discussion list'" <killietalk at aka_org>
Sent: Monday, January 02, 2006 12:50 PM
Subject: Re: [Killietalk] carbonates (probably)


> Bob,
> Since the post is on rainforest species (non annuals); is CO2 still a
> trigger for enzyme production?
>
> Cheers,
> Chris
>
> -----Original Message-----
> From: killietalk-bounces+cgraseck=optonline_net at aka.org
> [mailto:killietalk-bounces+cgraseck=optonline_net at aka.org] On Behalf Of
> rgoldstein at rjgacarolina_com
> Sent: Monday, January 02, 2006 9:59 AM
> To: killifish discussion list
> Subject: Re: [Killietalk] carbonates (probably)
>
>>>
>> 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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