How to know if eggs are fertile or not?

[Kantesh]

How do i know if an egg is fertile or not without breaking it open ,i am buying the eggs from a pet store and im not sure the eggs are fertile or not .Any help would be appreciated.

 

[pozees2]

Only other way is to incubate them and candle after 6-7 days to see if any are developing.

 

[Kantesh]

I mean ,i don't to get ripped off.I could take them back after 6 days and they guy would just ay there is something wrong with your incubator.Is there a way i could find out before i buy them or is it just a 50% chance.

 

[MGG]

There's no way to know unless you crack them open or incubate them for several days. Did you ask the owner of the store?

 

[Kantesh]

He says they are fertile but i just wanted to make sure.If i did crack them open ,what am i looking for?

 

[MGG]

He says they are fertile but i just wanted to make sure.If i did crack them open ,what am i looking for?

A blastoderm. Here are some pics of fertile egg yolks VS infertile egg yolks.
Fertile yolks

Infertile (red circle) Fertile (green circle)

And some infertile eggs.

 

[Kantesh]

I opened up one of the eggs today ,it was on day 5 .Either my temperature was high or i got ripped off.

 

[Kantesh]

Tomorrow is day 7,ill open all of them up.Could you tell me if they were fertile or not?

 

[Kantesh]

I know you just showed me pictures of how they look like ,but it's better to hear it from someone who has done it before.

 

[MGG]

I know you just showed me pictures of how they look like ,but it's better to hear it from someone who has done it before.

I have actually done it. I just don't take pictures usually. You won't be able to tell if they're fertile anymore. The blastoderm disappears in infertile or very early quitters by day 6. Your only bet would be candling. Have you candled? If any are actually growing and you crack them open, they'll die. There's no way to save them once they're cracked open. Just candle, and then go from there. If any are fertile there should be embryos inside.