Freshwater prawns are a tropical animal, and require warm water to survive. A correctly engineered, constructed and well managed pond will result in a predictable harvest of about 1000 - 1200 pounds/acre of a large, highly valuable 10 count/lb. whole shrimp. Below are some links to several manuals on the production of freshwater shrimp:

http://www.ksuaquaculture.org/Species/Prawn(Shrimp).htm - Kentucky State University Manual

http://msucares.com/aquaculture/prawns/ - Mississippi State University Manual

http://library.enaca.org/Shrimp/Publications/FAO_Macrobrachium_manual_2003.pdf - ENACA Manual