As the water warms in spring the colder-Denser water sinks to the bottom. Since it is much denser than the warmer water on top there will be an almost immediate temp change. = thermocline as the temp cools in the first few feet of the cooler water this will hold the more oxygenated water and most of the biomass in the lake. During fall the upper layer begins to cool as it cools it too becomes denser and the water that was really oxygenated becomes dispersed and diluted, the upper layer and lower layer mix and this is the fall turn over. The biomass (fish/bait) become disorientated and move up and down in the water column looking for that comfort level/highly oxygenated water. During this time fishing becomes VERY tough the fish and bait are in a funk till this mixing of the layers stabalizes. During this time the shad in the lake start looking for the plankton they eat and move a LOT and SO DO THE CRAPPIE (ALL SHAD EATERS). They are drawn to incoming reeks and flats in the back of these creeks. This is why the pool on Conway is so good in the fall early winter and why all the shad are in there. This doesnt only happen on Conway but EVERY LAKE IN THE NATION.