sexing livebearer fry

[bluestarjazz]

I know how to sex the grownups by their anal fin, but how can you tell the fry apart.
I currently have about 6 or 7 1/4"; sword tails and about 3x that many guppies between 1/8"-3/8"(more tan one drop). And by thee looks of my females at least one more drop of each is expected in the next week.
if I just go by their fin all of them are girls but not all have gravid spots and some of the guppies are staring to color.... at what size do their fins become an accurate way to tell them apart because I don't think they are ALL girls.

 

[livebearerfreak]

i use to breed livebearers ( hence the name livebearerfreak on petfish.net ) but wait tel they are about a half inche to an inch b4 u ACTUALY sex them

 

[bluestarjazz]

Okay thank you I guess they just need to grow up some more at least a few seem to have clor already so hopefully at least a few are boys my stud cold use some help
Still doing better than the last drop I missed the fact they had dropped and only two made it both girls but there was an injured gourami in the tank

 

[Jory]

im sure at least one out of six or seven will be male.