If you think they are in your pond, you might consider making a habitat friendly spot or two for them. They love hiding in rock crevices and a pile of broken cinder blocks in shallower water is perfect. In a little time a community will develope. Most fish love crayfish, especially young ones, and the rocky piles will become hotspots for both. Used to do alot of trapping in Pa., which is as rocky as it gets. We'd catch them in small creeks that led into the Susquahanna River, which has the best smallmouth fishing I've ever done. Probably not practical here, but we would get enough (along with some angry hellgramites.Ouch.) in an hour to last all day by, along with a friend, using a trap made of two pieces of wood about 3ft long, with 1/4" mesh net about 3ft tall and 5ft wide stapled to the sticks. Weighted every couple feet on bottom with like 3oz barrel weights. One guy goes upstream about 15ft kickin' up the bottom while walking towards the guy with the netted trap. When close, we'd lift the net. Occasionally we'd get some big females with a cluster of black eggs under her belly. Those went back. Since we used them as bait, in the same waters we fished, we prized the smaller ones. Fished in those rocky rivers, with just a tru turn hook and a splitshot, they, along with the hellgramites, were deadly on the smallies. Sorry so lengthy, just brought back some great memories, but look for rocks and you'll most likely find crayfish. Have fun.