You can stock snails and crayfish, but in all likelihood they will find their way into your pond naturally. You can buy crayfish from a number of different sources. Todd Overton probably could put you on a source of them. As far as snails, I know of only a couples places that sell varieties that would be good for RES to eat. They are all in the east though. I actually went and caught a few dozen from another pond and introduced them to my pond along with some clams to feed my RES. I am giving them a full year without RES to build their numbers before I introduce the RES though...
