That is what is said, but there can be other reasons, so don't lose hope.
My humidity and temps were spot on the first 18 days. Some of the eggs never started developing but at 18 days 6 eggs were filled with dark. Where were the air cells?
I had a sinking feeling but carefully laid them on their sides with the tiny air cells up and increased the humidity. I thought it was a lost cause. Five tiny chicks are now in the brooder and the final egg is still in the incubator. I have a feeling it got moved around.
I figured if the eggs were on their sides with the tiny air cell up, the chick had time to get in the correct position.
I have a feeling my reason for the small air cells might be different from yours. I had lost my young rooster and wanted some of his chicks so I was hatching fairly small pullet eggs, something I wouldn't do under normal circumstances, but if I wanted his peeps I had no choice. I think it was baby peep taking up the space and not fluid. But in any case you never know. Sometimes you might be pleasantly surprised. And I'm still hoping that sixth egg in the bator hatches.
My humidity and temps were spot on the first 18 days. Some of the eggs never started developing but at 18 days 6 eggs were filled with dark. Where were the air cells?
I had a sinking feeling but carefully laid them on their sides with the tiny air cells up and increased the humidity. I thought it was a lost cause. Five tiny chicks are now in the brooder and the final egg is still in the incubator. I have a feeling it got moved around.
I figured if the eggs were on their sides with the tiny air cell up, the chick had time to get in the correct position.
I have a feeling my reason for the small air cells might be different from yours. I had lost my young rooster and wanted some of his chicks so I was hatching fairly small pullet eggs, something I wouldn't do under normal circumstances, but if I wanted his peeps I had no choice. I think it was baby peep taking up the space and not fluid. But in any case you never know. Sometimes you might be pleasantly surprised. And I'm still hoping that sixth egg in the bator hatches.