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Re: Sex Ratios
In the commercial aquaculture field, there is often a need to produce large
quantities of a single sex. This is bacause many common food fish (i.e.,
Tilapia) stop growing when they start breeding. There is an established
regime of temperature and pressure used on the eggs of Tilapia which
guarantee all males from the hatch.
PS: My experience with Ruvulus is the same as Wright's. Whenever I have 2-5
fry in a container, I ALWAYS get a pair. I think this has to do with the
fact that Rivulus are not especially prolific and many tend to live in
restricted environments of questionable water quality. There are probably
chemical signals which cause the fixing of the gender at some point. It's
worth experimenting with.
Of course, the Marmoratus don't have this problem <grin>.
<<** Larry **>>
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