Hi Steve It's not unheard of. Koslowski wrote (don't remember if it was in his book or in an article, I'll check it out) about reported sex changes in Ap. nijsseni. I think the difficult part will be to show that the once fertile female is now a fertile male. I have a female (that has spawned several times in the past) that has been alone for quite a while. She is developing male-traits so all I need to do is find him/her? a female and see what happens. //Fredrik - -- Fredrik.Ljungberg@saab.se Saab Ab Flutter and Loads Department voice +46 13 18 54 60, fax +46 13 18 33 63