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Re: pH, temp and sexratio
John,
According to Römer & Beisenherz's papers your temperature is correct for 50/50
ratios for most apisto species, including your aggies & macs. Many things can
skew the ratio in an uncontrolled environment, like the wild or even your tank.
Some wild ideas could be that males are generally more bold, and the bolder
juveniles get picked off first. Or the mature males can tell which juveniles are
males and eliminate them before they become outright competition. It's hard to
say, but let's face it, in nature it's more important to have more breeding
females than breeding males (unless you're a seashores!).
Mike Wise
John McCrone wrote:
> [Mike Wise wrote]
> >The secret to getting the proper ratio of males and females
> >depends upon finding each species' preferred pH value.
>
> Has anyone got a chart of pH and temperature values needed for a 50/50
> balance in the various common species of SA apisto? The big-time breeders on
> the list must surely know the rough answers even if they've not done
> controlled experiments.
>
> All I know is that the few fry that survive in my community tanks have been
> invariably female. But I wasn't sure whether this was due to water
> conditions or just that females are tougher (pH between 6.5 and 7, temp of
> 26 C, GH 4, and fish were macmasteri and agassizi).
>
> Cheers
> ------------------------------------------------------------
> from John McCrone
>
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