That above is a common question in fly fishing forums. So common that, in fact, it is the title of a thread I read recently. And the most usual reply to that question goes along these lines: “Most fish are taken within 35 feet.”
But, what happens when the fish are active 20+ meters away? Do you pack all gear and get back home?
There is a particular stretch with big grayling up to 55/56 centimeters long —maybe more; I don’t know for sure, as seeing them and catching them are very different things, and I haven’t managed to catch one of the really big guys yet—,that you often see actively feeding suspended like floating in thin air at depths up to three meters.