I am incubating duck eggs. Should they smell fishy?
No. That most likely means they are rotten. When incubating duck eggs there shouldn’t be a smell, and if there is it should be very faint and hardly noticeable. You probably have a rotten one, and trust me, you want to find it before it explodes in the incubator. Put it in a zipblog bag and take it far away from your house. The smell will drive you out of the house if you don’t.