Re: Temp / sex ratio

[Ghazanfar Ghori <ghori@ghori.net>]

Nope - is there an ISBN number for that? Is it worth buying?

----- Original Message ----- 
From: "Rich Grenfell" <rgrenfell@sbcglobal.net>
To: <apisto@v2.listbox.com>
Sent: Monday, August 11, 2003 3:02 PM
Subject: Re: Temp / sex ratio


> Do you have romers atlas? He has some really
> interesting data in there abot sex ratios. i have
> found the same as John, 76 degrees usually results in
> a decent ratio. 
> 
> Rich
> 
> --- Ghazanfar Ghori <ghori@ghori.net> wrote:
> > 
> >    The pH in the spawning tank and growout tank are
> > both around 6.9-7.1. The
> > last
> >     batch I raised was at the same pH, with temps in
> > the low 80's. That one
> > turned out
> >     to be all female. It's really annoying! What
> > really determines the sex -
> > the temp & pH
> >     at time of fertilization or the pH/temp in the
> > growout tank?
> > 
> > ----- Original Message ----- 
> > From: "John Wubbolt" <BigJohnW@webtv.net>
> > To: <apisto@v2.listbox.com>
> > Sent: Monday, August 11, 2003 2:10 PM
> > Subject: Re: Temp / sex ratio
> > 
> > 
> > > Try to raise the fish in 75-76 F water temps...
> > > I've found that this seems to work best for most
> > of my apistos to give
> > > me decent sex ratios.
> > > also depends on the pH of your water too!!
> > > I've found very acid water with a high temp gave
> > me mostly males...  One
> > > summer, one of my grow out tanks yeilded 44 Males
> > and 3 females , Temps
> > > due to summer conditions were in the upper 80s and
> > the tank had very low
> > > pH, somewhere under 6 , i cant remember to be
> > exact.   Yet another tank
> > > in cooler weather yeilded 96 females and 4
> > males....  So im not sure
> > > what really caused my extreme ratio's.... I never
> > did check the pH on
> > > that tank that gave me mostly females.....  Funny
> > part was, i had NO
> > > problems selling all those females..... i thought
> > for sure i was going
> > > to have to use them to feed my Oscar pair at the
> > time...
> > >
> > > John
> > >
> > >
> >
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