Re: KillieTalk Digest V4 #633

[Frauley Elson <fraulels at videotron_ca>]

mjacobs2 at tampabay_rr.com wrote:
> 
> Lee and Wright and all..........I know that sometimes there are severe skewed
> sex ratios and it's not limited to Killies of course but in thinking about
> the "nature" of things.......what guarantee is there that we are starting out
> with a 50/50 ratio in the wild??? 

Years ago, when I was trying to figure out how to manage sex ratios in
Aphyosemion zygaima (I won't bore everyone with that case again, don't
worry) I came across an article in the Killi-Club de France revue, on
the CMBB 89 collections. My population of zygaima came from water
chemistry much like what I was offering them at home, and in which I was
getting up to 30:1 males. The collectors noted they had had great
difficulties in finding enough females although males were relatively
plentiful. I switched to much softer, largely rainwater tanks and solved
my problem, with that species.

We can speculate that maybe there are seasonal fluctuations in sex
ratios in some wild species, but personally, I don't know enough about
the specific environment the fish come from to say much of use - but
just enough to offer an anecdote. 

Gary
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