I put pea gravel in my ponds to create bedding areas for the bluegill and they seemed to like it quite well at first. Two days ago there were probably twenty large fish on the nests going around in circles or stationary near the nest. Yesterday I checked them and I saw only one fish anywhere. Do they abandon the nest like that or is there some other problem? The ponds are areated and the water is clear with visibility about three feet or maybe a little more. I checked the pond a few minutes ago and still saw only one fish. Any ideas or suggestions would be greatly appreciated.