I had a female swordtail that transformed into a male when I was a kid. It resulted in a gigantic male that didn't seem to mate with the other females.
When you buy feeders, you'll find gigantic males that look like they were once females and hence the long body, small tail and poor coloration etc. not sure if they had transformed, too.
Read somewhere that water conditions can determine gender of whole batch of fries. Not sure how, though.
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