sexing swords

[Laureth]

Hi people

I must be doing something right because I've got about 50-60 fry of varying ages. Now some of them look one way and some another, and so far, the oldest ones all seem to be female. How old does a swordtail fry have to be before you know for sure if its a girl or a late blooming boy? When does the male start growing his sword anyway?

Thanks
~Laureth

 

[snotirl]

If u looke at the anal fin (the fin on the under side of the fish) the males anal fin is skinny and long and the female is fanned! that should help u sex them!