I've always been curious as to the depth of the waters that anglers are fly fishing. You see, over here in the states, we have lake and pond locked trout, but you won't take them off the surface during the mid day, on account of predation. Early morning and just at dusk, and of course all night long. Otherwise you gotta go deep. At least 6 feet. I would love to fly fish a lock from a boat, and use only dry flies. That would be quite a change from how we do it over here.
