How do you tell if eggs are fertile?

[spiderkidsmom]

Our rose-haired tarantula has been on her egg sac for about a month now. We just took it from her to set up Rob C's incubator but when we opened the sac the eggs were just fluid filled with a little white in them. No baby spider parts. I thought after a month, we would be able to see little bits of baby spiders. We've only had her for a few months. She came from a reputable reptile shop, and has not molted since we've had her, so there is a chance the eggs could be fertile.

Is it possible for anyone to tell me how to tell if these eggs are fertile? It will be disappointing to incubate infertile eggs.

 

[WelshTan]

Can you post a picture of the eggs? That would be very helpful as it's hard to tell otherwise. The eggs may be taking longer to develop if the temps are lower also.

 

[TheHolyToast]

Do you know if she was paired, or had a chance at mating before you bought her? If she has been gaurding the sac the past month I would think they are still good eggs. They do sometimes lay infertile egg sacs. I had a rosea make one for what ever reason, and she cast it out in a week.
So if she was gaurding them, that is a good sign.
I agree that maybe they just need more time. Rosea are slow growers, so I would imagine the eggs would take a little longer to develope.
It may be a good thing that you pulled it when you did, from what I gather roseis are rather troublesome. She might have ended up eating it.
Good luck with your sac.

 

[curiousme]

These were infertile eggs.

We have never had good eggs, but i can show you what bad ones look like.