Yes, Monk. I was following from Stu's posting and I know he knows what the difference is as do I.
He said "Got me thinking, not seen a pope for a while." Perhaps he might have made it clearer if he'd said "Got me thinking, not seen a pope for a while, either."
They're two fish that don't figure in our part of the Thames much, nor the Thame (two different rivers btw). I used to catch lots of pope or ruffe in the 80's and one or two in the 90s, but I haven't seen one this century.
Gudgeon are also as rare as rocking horse droppings these days.