Dan,
I have never seen an HBG look any more GSF-ish than that. Don't discount the possibility that GSF along with BH invaded your pond during high water. Both like to go upstream in high water and have reputations for showing up where they were not planned or wanted.
If your water temp is still above 60, you might consider getting some predators in there ... or at least by next spring. Some advanced fingerling size would be better. There will be a fair amount of reproduction next year.
Those BH are pretty good to eat as long as water isn't muddy. Here is a fast way to
clean them.
