Re: Sex Ratios

[BizEcology at aol_com]

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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