>snip,snip.
>Hope this helps some. You may also want to know that I do not usually pull
>out the lunkers, so some of the difference *may* be due to cannibalism by
>the larger, faster growing ones (males?) on the runts (females??). Just a
>thought. I have a sm batch of 6 now and they are beginning to look like
>mostly gals, but are still small yet.
Personally, I think its probably temperature influenced as Gary mentioned. I
was reading an aquacultural article (still in press) and it mentioned
temperature "in passing" but didn't go into details.
some extracts:
"Sex reversal is the manipulation of the fish either with the use of
hormones or temperature to drive a population towards being completely one sex"
"The sex of an animal is determined by one of two methods:
1.Sex determination occurs at the time of fertilisation, when the
chromosomes from the male and the female join forming a zygote.
2.Sex differentiation occurs as the larvae is developing and there are
bundles of cells in its body that become various organs. The differentiation
into either male or female occurs as a group of cells are developing into
gonads."
Does anyone know when the sex of rainbowfishes is determined.
And I don't want any funny answers Bruce! - although 'tongue in cheek'
answers would be alright ;-)
Adrian.
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Adrian R. Tappin
"Home of the Rainbowfish"
http://www.ecn.net.au/~atappin/home.htm
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