When do guppy fry colors begin to show?

[ConfusedCatfish]

Im trying to determine the gender of some guppy fry but for now they are still so small they are almost transparent and i was wondering at what age their colors would show?

 

[NoodleCats]

You can start to sex some some time around 4 weeks, the females start showing a gravid spot while the males don't.

An example
Male fry


Female fry

 

[dougall]

You can normally look at the shape of the anal fin also. I would not try to go based on color.

 

[ConfusedCatfish]

Thank you for the help! I will try to take a look at both aspects, fin shape for now

 

[ConfusedCatfish]

I have a survivor that had been born while i was away, shes a girl. Safe and isolated now

 

[Sprinkle]

It is easy to determine gender of youngster livebearers. Later days on, bois will be kinda yellowish and girls will be kinda greenish/greyish