How did you sit up the pond for these guys? I'm sure rocks are the main element but any other tips for producing large numbers? Can't find any one selling native crawfish here so would it be safe to get some form the wild? I know I use to catch a bunch in the branch behind my house when I was a kid.

Final question: I Found a bunch of broken up concrete on site (I have permission to use it and dump it in the pond by owner)were should I place the rock? There some at the spillway already, most of it is cemented together though.