I also did traps in my creek with dog food (for minnows).
GSF were by far my biggest haul, and usually with zero minnows. I don't know if I was not set up correctly for minnows, or if once the trap started holding GSF, then the minnows would stay away.
I had much better luck seining to collect all types of fish species in each pool. I don't know if there are any crayfish in the shifting sands of my creek. However, we used to seine them up in rocky creeks when I was a kid.
If you have to go that route, perhaps chum the waters first with some sinking dog food?
I can (poorly) run my 10' seine by myself. If you do perfect your technique of drawing out the crayfish, then perhaps you can go back with a family member or buddy and seine out a useful number of the critters.
Good luck!
