JoeG,
Are you referring to ghost shrimp? If so, why not just net some and put them in your pond? They'll either reproduce or they won't. I don't think stocking large quantities of them will significantly improve your chances of success. Having nearly clear bodies, they are designed to escape predation without a lot of cover.
I stocked mine in a brand new pond. All the food and cover available was a few small patches of bottom algae and a few sprigs of bermudagrass that crept into the edge of the pond. I still don't have any aquatic vegetation to speak of, yet they are absolutely thriving. In my experience, here in the South, they are very hardy. It may be different in your area, but certainly worth a try.
