I'd also be interested in the gape of a Green sunfish.
Before or after I smash them with my foot and throw them back in the pond for CC food?
Seriously, I caught about a 6" one last evening just before dark and about a dozen 1.5-3" in a minnow trap (along with some bullheads
). Several 4" ones by hook and line. The next time I catch some will measure the mouth gape for you.
A 4" GSF is more like a 3" BG as far as size, but the mouth looks as big as a 7-8" BG.
I don't like to see them get up to 6". Means they have already eaten way too many of my BG fry. I catch lots of GSF in the minnow trap when I set it but no BG fry. Keep hoping to finally catch some BG fry.