These are interesting photos. I'm curious what you see that helps you say these are hybrids rather than green sunfish. I've got similar fish in one of my ponds and was just assuming they were green sunfish based on this Iowa DNR page --- but if you tell me what to look for, maybe I can look closer.

http://www.iowadnr.com/fish/iafish/grs-card.html

Are you looking at the dorsal fin shape compared to the photo 01 above?

Thanks...

1/3 acre & 1.5 acre ponds -- first year of ownership