The fly fishing code of behaviour was magically able to progress and to pave its own way toward the modelling on the natural resources. If we take a look at popular books and magazines of the past (but even just 30 years ago), the pages were full of dead fish exhibited hanging off a string. This view has changed radically since modern fly fishing has been developing to the extent of challenging the most exotic species from salt water to the Amazonas. Fly fishing and C&R conjugate the respect for fish's life with the preservation of the environment.