Never heard of Peamouth's having barbels, but there is no doubt, I got a ''little'' list of all the species in the Willy, I've researched all of them.
The chart (at bottom of page in link, PDF format), lists the fish species, whether they are absent, rare, medium, or common, along with what area they will mostly be found (above or below the falls). My jaw dropped when I first saw this chart.
Fish in the Willy