Re: Temp / sex ratio

[Ghazanfar Ghori <ghori@ghori.net>]

   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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