Re: [Killietalk] all fry of one sex [was: moina, Japanese daphnia]

["Doug Dame" <dameda at shands_ufl.edu>]

>>> Paul_Jablinski at notes.udayton.edu Monday, May 03, 2004 10:56:13 AM
>>>

>>  I used to raise lots of killie fry, but too often many grew 
>>  up to be either all males or all females, or too often I would 
>>  get a majority of one sex over another.  I forget the date 
>>  and year of the AKA magazine that told me if you put two 
>>  fry in a container for one month, they would come out a pair
>>  - male and female.  


Anybody of you pioneers with automated water changing systems done any
experimenting to see if high turnover rates eliminate or at least
noticeably reduce this problem?

Because if this is the result of accumulated hormone etc levels in the 
water, as I've always assumed, then presumably there's some flush rate
that will dilute the causal agent/s below critical levels. Just a
thought. 

Did I mention I'm very keen to see the upcoming JAKA article/s from Lee
and Barry on water changing systems? VERY KEEN. Probably not the kind of
article that would go over well with the advertisers of the mainstream
fish mags either, now that I think about it. Not that you all need any
extra encouragement from me to read JAKA !

Doug Dame
Yankeetown FL USA

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