We have had some discussion on this subject in the past ( you might find
some of it interesting if you can find it ) but from memory there was
faavour for both temperature and pH as modifying factors for sex ratios.
Temperature seemed to come out as possibly more significant with evidence
fromseveral specialty sub-groups of the aquarium hobby.
Here in Australia some experienced hobbyists felt that higher pH increased
female ratios and shellgrit substrates in UG filters were used with some
success. Some genera seem more predisposed to be affected by this too e.g.
Glossolepis.
My suggestion would be to try for neutral (pH 7) and go from there - peat is
generally a safe way to go if you are trying to go "down".
Regards,
Bruce Hansen
vicepresident - ANGFA Inc, ANGFA (Qld) Inc
Please visit us at http://www.angfa.org.au
----- Original Message -----
From: "william taylor" <wtaylor at austin.rr.com>
To: <rainbowfish at pcug.org.au>
Sent: Monday, February 12, 2001 5:19 AM
Subject: [RML] Breeding questions
> I've heard that pH affects sex determination. Is this true? If so, what
pH
> ranges will produce more males? Also, if it is more acidic that produces
> more males, what are some good (easy, inexpensive) ways to get acidic
water.
> For instance, can I just add vinegar to lower pH (I'm assuming not, but
> why?)? My local water is about 7.4 and I get about 60-65% females
> (estimate).
>