AW: [RML] Breeding questions

Harro Hieronimus (Harro.Hieronimus at t-online.de)
Mon, 12 Feb 2001 10:40:46 +0100

It is very difficult to generalize these findings. There have been several
scientific studies. In several livebearers there was no evidence for pH
influence, however Roemer found some results in Apistogramma, where the sex
ratio may be influenced in some species. You may be right in observations in
your aquarium - but this may be accidentally, even if it occurs with several
breeders. It would be more than interesting to examine this scientifically,
but difficult (you need several tanks and constand conditions).

Regards Harro

-----Ursprüngliche Nachricht-----
Von: owner-rainbowfish at pcug.org.au [owner-rainbowfish at pcug.org.au] im
Auftrag von Danny
Gesendet am: Montag, 12. Februar 2001 09:19
An: rainbowfish at pcug.org.au
Betreff: Re: [RML] Breeding questions

Ive found the harder the water the more males in the glossolepis genus
and warmer acid water produced more females.
also had simular results with Boesmani as well
Danny Walker

SANFA http://www.sanfa.org.au/
ANGFA http://www.angfa.org.au/
Aggies Aquariums Serving Adelaides Native Fish Needs
(08) 8359 - 7099 ph/fax
0416-226-512 mob/SMS
reklaw01 at bigpond.com

-----Original Message-----
From: william taylor <wtaylor at austin.rr.com>
To: rainbowfish at pcug.org.au <rainbowfish at pcug.org.au>
Date: Monday, 12 February 2001 5:55
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).
>
>Any other controllable factors affect gender?
>
>
>Thanks,
>
>Bill
>