1. HBG, can't tell the sex. Could it be carrying eggs?? Obviously the vast majority are males. This would be a very interesting fish to do a "procedure" to, in order to evaluate.
2. Male bluegill. Just give him about three more weeks and the colors will become obvious. Certainty rating: 95+ percent. Was the water stained at all that the fish came from?
3. Female bluegill. This isn't a slam dunk. I'd like to see the other side of the fish, but given the photo I'm thinking probably female. Certainty rating: 80 percent.