If you can see the fish or not depends greatly on the water clarity and the depth, there are places with crystal clear water where you can see the fish on the nest, there are other places where the water clarity doesn 't allow you to see the fish but where you can see the nest ( a clear patch on the bottom abouth the size of a tire ), there are other places where the water is very stained or muddy, you can 't see the fish nor the nest, in those places it 's the general location of what a good nesting site would be ( shallow and close to the bank where the sunlight penetrates dep enough to incubate the eggs ). Polarized lenses help, but as always, to spot the fish you have to learn how to spot them, it 's something you learn through observation.