I would suggest talking to your state university Zoology or Biology dept. or what passes for Natural Resources Dept. I believe there are true freshwater shrimp native to your area that would better match the aquatic conditions.
There also may be species of Gammarus that have adapted to your climate. (likely in the mountain lakes if they haven't dried up.)
I know there have been studies in your area as I have seen some of the papers.
I'll look in my files and see if anyone stands out.
Knowledge of the local species that will adapt to your pond is the best starting point.
If you have to get your own they also may be able to tell you where. I can help you with how to catch what you need.
Let me know what they say.
Ill helop as much as I can.
Your Ag extension office may know also.
Barry
