Swordtail Sex Changing

[Flying_Squirrel]

Hi all,

Just wondering what would cause every single one of the fish born in my tank develop into big female swordtails, then after a couple of weeks turn into males.

I at first thought it to be because the males are infertile but my female has been inpregnated by both adult males previous to the further 3 fry that have developed since.

This is a problem for me as I only have a 60l tank and there is not room for 5 males and one female.

Thanks for help,

Flying_Squirrel

 

[Annastasia]

How old are these fish? Could it be a case of late developing males?

Why don't you sell some males, or give some away?