I noticed when we shot bigheads down in KY that almost every one we shot was a female. We shot at the bigger ones so maybe the bigger ones are females or else there are just waaay more females than males swimming at the surface.
I also noticed that just about every deer I shoot ends up laying shot entrance side down. Seriously. It's weird. (four out five this year... and the one that ended up entrance side up fell off the side of a ravine so it doesn't count) I thought I should toss that out there.