Glad you brought that up. I need to do some checking to see if I still have any of the PK shrimp. I have not noticed any in the traps but they are easy to miss if not looking for them, being clear and not very big.
I will pay more attention to the traps and I need to go out at night with a dip net and see if I can net some. I hope they are still there. But you are right about the predators and this pond till very recently had no submerged weeds and only a small patch of spike rush now for cover. The only real cover they have, and there is lots of it, are 3" or so diameter crushed limestone rocks.
