I must have more than I thought I had. Left minnow trap over night and along with the FHM were three more PK shrimp. So I assume they must like the feed. They were full size and seemed alive and well.
Putting out a crawdad trap tonight. The mesh is big enough they may be able to go through it, but if I bait it about sundown and go out in a couple hours, maybe some will still be in it.
I think a person could make a trap similar to a crawdad trap, only smaller with smaller opening and out of screen wire or very small mesh wire.
U-Tube video on catching and using grass shrimp for bait 
