Freshwater Prawns: Small Juvenile Prawns. These Prawns are small and will be about ½”-3/4” in body length. (15-20 days old). Smaller prawns are easier to ship and more can ship in a box, saving on your shipping cost. Shipping will be over nights (Wednesday only) for all orders. All orders are shipped weather permitting. Orders may be put on hold up to 2 weeks depending on weather conditions.