RE: Sex ratios

["William King" <wking at micromuse_com>]

Maybe a simple answer to some peoples sex-ratio problems would be due to
bullying from an early age.   I have had a slight male dominance, in my
bitaeniatum offspring and wondered if the faster growing and bigger males,
where just outcompeting or even directly bullying some of the female
offspring.   Probably a gross oversimplification, but something that would
need to be ruled out in any study on this, especially if fry just disappear
now and again, with no apparent reason.

William King

-----Original Message-----
From: owner-killietalk at aka_org [mailto:owner-killietalk at aka_org]On
Behalf Of Rjga at aol_com
Sent: 21 June 2002 21:19
To: killietalk at aka_org
Subject: Sex ratios



In fishes there are XX-XY systems of sex determination AND other systems as
well, some of which include sex determination factors on more than one pair
of chromosomes. This is a complex subject only because of the variety of sex
determining systems. In killies, it is reasonable to assume that there are
tetraploid populations in addition to diploid populations, and there may be
more complicating factors than this. Bottom line is that with so many
possible sex determining systems, there are likely to be multiple
sensitivity points (receptors) to a variety of environmental conditions. I
think we first need to understand sex determination in fishes (overall
variety), then see if there is useful information specific to killies, and
how variable these systems are in killies. I may do that research if Pet Age
magazine asks me to do a review of the subject. I think that would be a good
starting point from which we could design some projects for graduate
students (might as well find !
cheap labor) who would do a bang-up job.  - Bob G.
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