are Palaemonetes paludosus limited by northern climates?
I believe so as they are just found in southern climates.
http://en.wikipedia.org/wiki/Palaemonetes_paludosusPalaemonetes paludosus is common in southern states east of the Appalachian Mountains. It is also found in Louisiana, where it may not be native, and there are scattered records from further west, in Texas and California.
The type TJ is getting are adapted too northern climates, they are raised here in Nebraska.
Palaemonetes kadiakensis
Common name: Mississippi grass shrimp
Native Range: This shrimp ranges from northeastern Mexico, Mississippi River north to the Great Lakes and east to Florida. It is sporadic in the central US, west of the Allegheny Mountains, and from the Gulf of Mexico to Canada (Pennak 1989).