I think it is more likely that they hear your footsteps coming on the side of the pond. Mine can.
At first I think, "Evinrude's using an automatic feeder and doesn't
have to walk to the pond." Then, I realized that whenever he has observed the fish anticipate the feeder going off, he
has walked to the pond. In short,
he has changed the outcome by observing it.My hat's off to you, DD. Leave it to a good ole' boy from Muleshoe to apply Von Heisenberg's Uncertainty Principle to pond management! (The first example of what shall be known as "Quantum Fishing".)