I would love to get some thoughts from others.
Those 3 look like GSF. I don't see any BG (or HBG) traits in any of them. Only slight possibility that No. 2 is part HBG is the yellow on the fins , which can be (but not exclusively) a HBG trait.
Eric knows what he speaks of. I would go with his evaluation over mine.
I will say when I am hand feeding my fish the telltale sign I use in my population is the fin tipping. Fish swimming around in green water sometimes are hard to identify from the shore. But in a group of fish my BG will have solid color tails and GSF or hybrids with GSF in them will have yellow or less frequently reddish tipping on the fins. I can spot them easily in a group of fish feeding. One exception is I do have a small population of CNBG within my overall BG population and they will sometimes have a very slim white tipping of the tail fin. But it does not show up nearly as obvious at the yellow tipping of the GSF.
I have always speculated that I should be able to pick the GSF out from the bank by looking at the shape of the fish. GSF are more shaped like a bass and BG are taller more dish pan shaped. But something about being on the shore and looking downward into the water, all the fish look more elongated than when I catch them and have them in my hand. So the only definitive feature that I can consistently pick out the fish with GSF in them when on the bank looking into the water is seeing the fin tipping.
