shrimp traps work good, canned catfood with holes stabbed in it is the best bait ive used.. another good way is if your fishing from a dock, take a fishing line and put a hook on the end with a chunk of trout on it, tie it to the dock and let it sink to the bottom, check it in about 10min or so and a crawdad will crimp on with his claws and will stay on until it leaves the water get a net that you can reach the watter with and net it as soon as you can see it, net it from the behind of it because it will swim backwards.