So I typically cull every BG in my 1/4 acre pond that I can't 100% ID as male regardless of size. The pond is only effectively 2 years old so this is the biggest non male (about 90% sure it's female) to date. And it's the first one I put back. This photo isn't the best angle, but she's starting to get a little bit of helmet head. I know the amount of eggs I'm putting back into the pond is a lot more than a fish of smaller size, but I really liked the build of this fish and want her to pass on the genetics.

http://i1373.photobucket.com/albums/ag368/lukkyseven/20151026_154519_zpsdsmhezzw.jpg