Nice vid. The bottom line is that the eye of virtually any organism can only maintain distinct, sharp focus for a brief period of time needed to execute eye-"hand" coordination (2 to 4 seconds in humans, and less is optimum). Motion--or the appearance of it from turbulence, shadow, flash and so on is the trigger of a fear response or a feeding response. Unusual motion or flash or color is what gets noticed in the midst of a range of motion/flash/shadow that is comfortable and routine to the fish. And most of these unusual visual intrusions soon become routine and unobtrusive to the fish.
One of the best examples--I'll use landlocked salmon because they adapt very quickly--is that fish will spook and move in response to the wake of a watercraft or wading angler. Keep wading or keep moving the boat or letting it skew in the current and you keep spooking and moving the fish. They are moving in response to the current changes, but the motions of the boat/angler causing them are the associated visual intrusion. Wait a while from a fixed position, either standing still or anchoring the craft so it hangs dead strait in the current with a consistent wake, minimizing motion in the craft so as not to rock and shimmy the wake. It won't be long before the fish start feeding on the wake edge, just as they would on the "V" below a boulder. Don't cast yet. Wait a while longer and they will come inside the V. Longer wait, some will be in the back eddy below the boat, just as in the pocket below a boulder. Now start fishing, inside out. And if it's not obvious, these fish full well could see the boat, the anchor rope, and so on. It is right in front of them but has become part of the norm.
Same for various bankside/shallow wading strategies. Wait first, just like a heron does. Then don't "flap your wings"/cast half way across the run any more than a heron will fly over there. The fish he wants is under his "nose" and probably decided to look like a rock when the bird flew or stepped in. Soon the bird looks like any other stump. The bird will only move or stalk (cast) farther after he catches the first fish.
Minimize the startling movements by approach, position, and pause, and you can catch fish under your rod tip--no matter its color. The fish can see you or your rod or line or your feet on the stream bottom, and so on. They only the notice the fly because it is new in an otherwise dynamic--but stable--visual environment. And it looks like food.
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