I had the same thing happen on my pond Headhunter. In the three years that we've owned the place I had never before saw them on the pond, then suddenly this year they appeared (I wonder if had anything to do with the fact that my pond has much less weeds in it than in prior years?). The stayed close together in a cluster. Occasionally they would find something at the surface and start a feeding frenzy (I was not able to identify what they were eating that go them so excited, Pop Tarts maybe?).
One interesting item is that when we first saw this cluster there were several adult GSF circling around the mass, it almost seemed like they were herding them. Occasionally a GSF would rocket forward and eat one of the litter fellers.
DIED identified the adults on my pond as Bullheads so I figured that these were Bullhead fry.
My pond is a haven for the oppressed with Green Sunfish, Bullheads and Turtles.
"Come see the oppression inherent in the system." <--- Monty Python quote just for Theo.
