There have been volumes written on this subject. Much of it focusing on whether the sun is in front or behind the fish. Even to the extreme of matching the hook color to the light conditions. :Eyecrazy: Makes sense when you read it but too much for my pea brain to absorb.hisgarness said:We all have to speculate on reasons for fish behavior largely because the fish do not take surveys well. If you could plot a graph, I'm confident that mornings and evenings would plot signigficantly better than mid day. Further I am confident that the sunrise/sunset curve would not be as dramatic in the Winter as in the Summer. It is my personal conclusion that fish do not like looking directly into the Sun any more than we do, ( they do not have eye lids, hats or sunglasses ). If you're working a fly on a sunny day, ( and clear water ), in the direct sight line between the sun and the fish, I don't like your chances. However, if that sun light is behind the fish, I think you're good to go. I have noted better success in the middle of a bright day when in a shaded or indirect light situation. There are other variables; like has the water been stepped on which is more and more likely as a day wears on; barametric pressure, etc. - - - but I think the amount and location of the light is key.