Anyone out there familiar with the float test?

[brandy6810]

So I did this since it's day 31 on my Cyuga ducks, I've candled them and I had 12 at the start I have 9 eggs left and after candeling them they all have fully developed ducklings in them. Anyway I had one that floated about 3/4 of the way down the bowl, 2 that sunk and 6 that floated at the top but only about 10% out of the water I'm assuming that's the air cell keeping them up. Can someone tell me what exactly result wise I have?

 

[duckmeister]

Over the past many years, bet I drowned a whole bunch of ducklings and goslings that ended up making it to full development in the shell but never hatched. I would use candling to determine viability of incubating eggs, just my opinion.