At the time I was completely sure these were Cambarus diogenes and completely legal to collect, I've caught crays there before and saw an adult male and 2 adult females, and this doesn't fit in any of the fish discussion sections above that I could see. Maybe I missed it or should have put it in other. Anyway I caught these in the washed out fossil area south of the coralville spillway where they hide in the slow run off under rock ledges where mud collects and to just repost what I have on the other natives forum:
I caught a bunch of these guys months back. They were about half this size. These have stopped growing though. I separated them out as falling behind the others from the same pool in the rocks along a stream and with the same coloring of blues and browns with a bit of dark red. The others come nowhere near fitting in these tubes anymore. They get New life spectrum algae pellets, brine shrimp flakes, I rotate 2 other brands of algae wafers that are more carnivorous than NLS, the occasionally caught guppy, some excess snails, some vegetables or aquatic plant matter.... I added crushed coral to my invert tanks because I was having shell issues and a lot of lost front claws on molt but they've stayed the same size while slowing down molting at the same speed as their larger counter parts. I am guessing them to be devil crayfish. If someone could confirm and are they just the weak ones that would have been eaten? Slow growing females? I haven't tried to confirm gender. I have culled down to 2 males and 2 females from the ones that kept growing. These 5 are living in this tank with tubes and lava rock with only some posturing over food.
The bigger ones before they got even bigger