Hello Dean,
I contacted a travel agency via Internet to organize my fishing trip last year. They adapted the program to my dates and preferences - like a tailor made trip, I am pretty sure that they will be able to help you.
The person that I was in contact with is Carla Fernandez and her e mail address is
info@argentinasanglers.com. You can try that!.
Hope this helps. Enjoy your vacations!.
Michael