Rawthumb:

You have some waters open for flyfishing (C&R) during our fall/ winter in Patagonia. Some are Alicura lake (Dam), Moreno lake, etc.etc. If you wish to go to Patagonia, just let me know it and I'll check our regulations and inform you. You also have several places in Cordova Province and Mendoza Province but nothing compared with Patagonia, which is not so far from those places.
Rocketfish
Argentina