Re: Temp / sex ratio

[Rich Grenfell <rgrenfell@sbcglobal.net>]

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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