jpsdad, in answer to your GSF question, the answer is yes. At least in 1 pond.
Pond is 1 ac. Stocked with FHM, GSH, YP, RES. 2 years later when the owner wanted to stock SMB, he asked me to do a fish survey prior to stocking to see if there was enough fish to support SMB as predators. There was an amazing amount of GSF in there, all 2"-4", even the GSF that were 2.5"-3" were gravid. There were absolutely no FHM in there, and the GSH, YP and RES were all the same size - none of the stockers had any fry survive. The pond was then partially drained and rotenoned, then restocked.
Owner had the pond dug in a wet spot in the woods, and they didn't sterilize the water. Spoils from the excavated pond were piled around the pond and spread out to eliminate any water from the woods to enter the pond. Sandy soil, high water table, the pond filled up from the groundwater seeping in.
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