In snrub's photo where the fish is lying on the rocks facing to the left, check out the wavy patterns or striations on what remains of the tail?
And Esshup brings up a point I hadn't noticed. The gill flap appears relatively intact in this photo, and it seems to come to a point, with no evidence of an opercular tab like a 9" RES should display.
And yellow eyes on a RES?
Are we seeing everything we should be seeing in the photo where the gills are displayed, or has damage been done there?
Man, I gotta' stay with crappie.

And in Highflyer's mystery fish photo, it looks like a RES to me, possibly with some BG in the lineage.