There are some past posts regarding the stocking of crawfish. It is worthwhile to try to establish them now, this spring. They may populate, and they may not. I believe that the bugs are misunderstood...

We have a good population of crawfish on the farm, but they dwindle in ponds with larger catfish and bass. They stack up in forage fish ponds and we have a cook cookout every July.

Your wetland areas "should" help to shelter and sustain them.

It's ALL about the fish!