I can't speak for the Vaal but on heavily pressured C&R trout waters in the WC, the fish are definitely more "educated" and harder to fool than trout in less fished streams. Besides fish numbers decreasing, I presume it would be the same for the Vaal. We normally combat this with better presentation, more natural colours in flies and smaller fly sizes.
“Apparently people don't like the truth, but I do like it; I like it because it upsets a lot of people. If you show them enough times that their arguments are bullshit, then maybe just once, one of them will say, 'Oh! Wait a minute - I was wrong.' I live for that happening. Rare, I assure you” ― Lemmy Kilmister
Reap the Whirlwind - WM
Paradise = A 3wt Rod & a fist full of someone else's #32 parachutes
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