https://en.wikipedia.org/wiki/Coregonus_hoyi
Lots of chubs in our streams and rivers too, but J has it right a different species than them, and a much different look. Many years ago I went to buy some minnows at a bait store in PAB, in the mix of big minnows and chubs was was a mooneye, never had seen one before and I passed on it even though it looked good for bait, just didn't know if it was legal for bait, and I didn't have much confidence if they did either.