update and something odd IMO:

Yesterday (July 21) I observed a hybrid bluegill on a nest beside several other nests occupied by others the same, however on this one particular nest, there were two young perch right beside the hybrid bluegill mimicking every move as if all 3 fish were attached and moved exactly the same way etc. All fish were stocked together on June 3rd of this year as you can see in this thread. These nests are made in a bed of small gravel that we added about a month ago and the water depth is less than a foot where this is taking place. I have never seen anything like this. Three fish moving in unison. The perch slightly smaller than the Hybrid BG