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