Ours are really similiar Nick, but are called Yabbies. Nearly every farm pond has them and a yabby trap or even a stocking with a piece of meat in it and its pretty easy to catch them. They are farmed in their millions.
The freshwater creeks around here have another type, the spiny yabby and he's a much bigger yabby. Getting up to a small lobster size. But they aren't farmed (as far as I know) like the smooth shelled smaller yabby is.
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