Dear All,
It is my belief, that barbel of monstrous proportions, can literally turn up from "any" river that contains healthy barbel populations. Also my belief is that river size has little to do with it aside from possibly big river barbel being harder to track down initially. Big river monster barbel are also less likely to be caught simply because the majority of big river banks are hardly fished, due to the fact that most that target big fish go to the "named" areas only. And it is along these vast hardly fished big river stretches that huge dark shadows glide, unseen and unnoticed in deep pools where they grow massive. I think it was possibly Fred Buller who said "big pike thrive on neglect?" The very same doctrine can be applied to any fish species in that if they are left alone amid healthy watery environments that are rich in natural food, they will grow very large.
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agreed, the size of the river is irrelevant, look at past evidence.