RAH, I added 4"x8" limestone rip rap to the top 10' of slope on two shores of my pond along with an under water peninsula that is covered with broken brick and block that extends down to about 15' of water. If you visit my build thread, it will give you some pics of what I did to create ample habitat for the crayfish in my pond.
In a small pond like ours, the goal is to give the crayfish holes and pockets to be able to hide in long enough to reproduce. If they can't hide, the SMB will make short work of them once they are big enough to eat them and clean out the pond.
1 Acre Pond with SMB, YP, LMB, GSF, RES, FHM, GSH, Papershell Crayfish, Pike 5.5 Acre Pond with LMB, BG
