I’m sure they are piscivorous but I took this one on a #16 red/black chronomid. I was on a bank about 6’ above the water which is crystal clear, saw it come up and take.I wonder what this fish feeds on most of the time. Hard to imagine a fish of this "girth" eating midges. Baby ducks - other fish, probably?
it was about 28” and thick, iirc length/girth calculations were 12.5#.
day before I took one at 33” (18.5# length/girth method) on a #12 Callibaetis emerger.