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Re: Sex Ratios

High David,
Although I do not seem to be raising as many
spoorenbergi as you, I get approximately equal numbers
of males as females.  Sex in fish is largely
detremined by environmental conditions.  Since you are
getting high percentage hatching most of your
environmental conditiions are in good.  The one
variable that you did not mention is temperature at
which the eggs are incubated prior to hatching nor the
temperature at which the fry were raised.  These
temperature factor may be the link to explain the sex
ratio.  I keep my fish at 75 degrees and the eggs are
incubated and raised at 75-77 degrees F.  If you are
raising your fish at lower temperature try reaising
the temperature or if higher lower the temp.  Since it
appears that you try varying pH, and hardness levels
try temp.

--- David Ramsey <djramsey30045 at yahoo_com> wrote:
> My lack of success is rally getting me down on this
> one. Fp spoorenbergi. I have a batch of 60+ fry that
> are 2" or a little more. ALL females. I have another
> batch of 40 or so, that are 1" or better. One well
> defined male, the rest females. I have over the last
> 2
> years tried hard water, soft water, low pH, high pH.
> I
> have raised at least 3-400 of these fish and have a
> total of 4 males to show for it. I have used peat
> pellets, moss, mops, dark tanks, light tanks, always
> females females females. Age of parents doesn't make
> any difference.
> Do one of the science type guys know of any research
> that shows either what effects male sperm production
> or male sperm viability? The number of fry tells me
> that I am gettting high hatch percentages, there
> just
> are not any males. Perhaps a amino acid or mineral
> missing of something?
> David Ramsey
> 
> 
> =====
> David Ramsey
> djramsey30045 at yahoo_com
> 
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=====
Allen H. Johnson
132 Whispering Oaks Dr.
West Chester, Pa.  19382

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