It doesn't seem like there are a bunch of crevasses and cracks among the rocks for the crayfish to hide in. I'm sure some might avoid predation, but I don't think that there are enough hiding spaces for them to thrive.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).