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No, the single white dot does not mean the egg is fertile. That is the blastoderm, the half of the genetic material provided by the hen. In the pictures I posted and the second picture from the OP you can see a ring has formed around the white dot. That is the formation of a blastocyst that...

That doesn't stop them from being fertile though!

Bulls-eye!!! He finally hit the target.

Are all the eggs from the same girl? What breed is he? Some of the males are more virile than others. He might also just have bad aim.

Not fertile. These are fertile: How old is your cockerel/rooster?