The book was John Hope's "Track'n Trophies." I think this behavior certainly exists in a lot of southern reservoirs. I spoke with John about it one time and he told me that every fish he tracked over nearly a 15 year period exhibited this exact behavior. John said the fish never left their preferred layer, with the lone exception of deep layer fish heading shallow for the spawn. I'm not sure the behavior exists in all bodies of water, particularly in less fertile lakes in the north, but I do believe it is very common behavior in Texas water.
"Bragging may not bring happiness, but no man having caught a large fish goes home through an alley." -A.L.