The coloration and body shape are what I'm basing this on. If you follow the curve from the fish's lips down to her pelvic fins, you'll see it's a relatively smooth transition, and flows fairly uninterrupted. On a male, there is a pronounced "hump" in the chest area, which causes a ledge, or bump in that arc.
My males are darker along the back, and their bellies are deep yellow or gold, especially pronounced during the spawn. They can be longer and not quite as tall, but not always.
Here are a couple males I caught last night also:
Here are a couple females from last year together with a native female. They are gravid in these photos, verified upon filleting.
Male from last year in spawning colors, and displaying the deep, pronounced chest hump.
