Do u happen to have any pic's before and after?
Would love to see photo's u can show.
It's just that their is no evidance that i know of other then reports of it.
Until then it can only be classed as a myth
Even if has happened to your self.
I'll be happy to look at any fish people would like to show me, and even better if one dies freeze it and I'll love to document it.
The fish in the foreground used to be a female, & the other one is in the process of change... She recently delivered...

The original male is the one at the bottom
