I have been raising sunfishes in ponds and tanks for some time now and seeing something new that was hidden because of the tank size used and that I am not in ponds every day. I do get into ponds a lot more than other fish culturist I know.
Bluegill up to about an inch in a pond setting move in roving shoals that approaching schooling behavior. I am unable to make out home ranges so my thinking is this is the period in life when they are most likely to disperse under their own power. At some point when they are more than 1" they adopt at least transient home ranges. In the typical tank settings we use and I observe almost daily, the fish move very little except to get at food. In circular tanks they form a large torus that does little more than compensate for current of self-cleaning tanks. You can have 20 tanks in parallel, each with several thousand larvae - fry, and see the same thing in every tank.
For another experiment that is still in the acclimation phase, I cleared what we call the teaser system of adults and stocked a little over 100 fry into it. The tank is 10 feet long. The fry are moving about in a big way as roving schools that constantly change in make up. At some point these fish are going to abruptly change their behavior and it is going to be size or age related. Work with Redspotted Sunfish indicates to me that differences between species with respect to this behavior are likely to be huge.