When is the best time to try and see crayfish? I stocked 50 back before I had put in any YP, but haven't seen any since. I also stocked 400 grass shrimp and haven't seen one since. It's a newer pond with zero plant growth. I dumped in a lot of 8" rock in several places around the pond. Shine a light down in the rock at night?
I'm iced over right now with very cold temps coming, so no swimming for a few days.

12 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs)
I think that's about all I should put in my little pond.
Otter attack in 2023.