At a river I fish there is a gas line or something that is underwater and runs out to almost the main channel on the river....Well there is holes or something and in this one spot there is a bunch of bubbles everywhere and its like an arreator under the water and the area that is arreated is about 26 to 40 foot. Now in the summer I can go out there and never move the boat all day and catch fish my guess is they would chase shad through the bubbles or something....Well went out there the other day and the graph looked like there might be some fish on the very bottom but i didnt get a bite and fished it for a while. Would they be even around water like this in the winter....the waters about 47to 50