what is the primary factor to move the crappie into shallows: 1) water temp, 2) shad feeding, 3) reduced sun light, 4) water level, 5) all the above??????

I'm guessing water temp in the main lake to get the shad into the warmer shallows for feeding and the crappie follow them in. BUT, I also know that the position of the sun REALLY affects other critters, but not sure bout fish.

I also know that there is not as much weather variation in the fall, but the corps is beginning to get to winter pool. All that affects the fish location.

And........go!!!